
    Victor W. PATTERSON, Plaintiff-Appellant, Toby G. Breedlove, Plaintiff-Counter Defendant-Counter Claimant-Appellant, Jeannine B. Rulis, f.k.a. Charlotte Jeannine Breedlove, Plaintiff-Counter Defendant-Counter Claimant, v. CITIMORTGAGE, INC., Defendant-Counter Claimant-Appellee, Mortgage Electronic Registration Systems, Inc., Defendant-Appellee.
    No. 14-14636.
    United States Court of Appeals, Eleventh Circuit.
    April 28, 2016.
    
      Alexander Thomas Stubbs, Law Office of A. Thomas Stubbs, LLC, Decatur, GA, for Plaintiff-Appellant, Plaintiff-Counter Defendant-Counter Claimant-Appellant, Plaintiff-Counter Defendant-Counter Claimant.
    Tala Amirfazli, Bret Adam Beldt, Ashby Kent Fox, John O’Shea Sullivan, Burr & Forman, LLP, Atlanta, GA, for Defendant-Counter Claimant-Appellee, Defendant-Appellee.
    Before ED CARNES, Chief Judge, JILL PRYOR, Circuit Judge, and REEVES, District Judge.
    
      
       Honorable Danny C. Reeves, United States District Judge for the Eastern District of Kentucky, sitting by designation.
    
   ED CARNES, Chief Judge:

Victor Patterson and Toby Breedlove appeal from the district court’s grant of summary judgment to CitiMortgage, Inc. and Mortgage Electronic Registration Systems, Inc. (“Mortgage Systems”). They seek to enforce a contract between Patterson and CitiMortgage for the sale of Breedlove’s home to Patterson for a bargain basement price. CitiMortgage contends the sale price stated in its offer letter to Patterson was an obvious clerical error and that the contract should be rescinded for that reason. We agree.

I.

In 2007 Breedlove obtained a $550,000 loan from CitiMortgage to finance the purchase of a house in Gwinnet County, Georgia. By 2008 he had fallen behind on his payments and the loan went into default. Hoping to avoid foreclosure, Breedlove sought to sell his home to Patterson through a short sale and Patterson communicated directly with CitiMortgage to negotiate the sale. During those conversations, CitiMortgage emphasized that it would not agree to a deal unless the short sale would generate a net payout that was greater than the expected proceeds from a foreclosure sale.

After 'several months of negotiations, Patterson made a series of escalating offers to CitiMortgage. He first offered to buy the house for $371,000, which would have provided a net payout to CitiMort-gage of about $350,000. CitiMortgage rejected the offer. Shortly after that, Patterson offered to buy the house for $412,000, which would have provided a net payout to CitiMortgage of about $391,940. CitiMortgage rejected that offer. Patterson then made a third offer to buy the house for $444,000, which would have provided a net payout of $412,620 to CitiMort-gage. What happened next is the source of the parties’ dispute.

CitiMortgage internally decided to accept Patterson’s third, offer on the condition that he reduce certain fees associated with the sale, which would have increased its net payout to $423,940. CitiMortgage intended to convey that counteroffer in a letter dated September 19, 2008 that it sent to Patterson. Because of a clerical error, however, the letter actually said that CitiMortgage wanted a,net payout amount of $113,968.45. In relevant part, the letter stated:

This letter serves as CitiFinaneial Mortgage Company Inc.’s (CFMC) authorization and acceptance of a short payoff on the above referenced account, in- the MINIMUM 'amount of $113968.45, or the net proceeds from closing settlement, whichever is GREATER.

The letter also set a closing deadline for October 24, 2008. CitiMortgage faxed the letter to Patterson with a “re line” that read, “Toby Breedlove Shortsale approval.”

After' receiving that letter, Patterson told CitiMortgage that he wanted to go forward with the short sale, but the parties never again discussed the payoff amount. Patterson scheduled a closing, revised the sale agreement to reflect a sale price that would produce a net payout amount- to CitiMortgage of $113,968,45, and obtained a $130,000 loan from a private lender to finance the purchase.

A lot happened on October 23, 2008, the date of the closing. The closing attorney disbursed payout funds of $113,968.45 to CitiMortgage by-wire transfer. Only then did CitiMortgage realize its mistake. A CitiMortgage attorney immediately attempted to contact the closing attornéy to let him know that it would be rejecting and returning-to his office the $113,968.45 in funds. Because the closing attorney was not available, the CitiMortgage attorney left a message with that attorney’s assistant stating that CitiMortgage had rejected the funds and would be returning them because the net payout amount was based on a clerical error in the September 19 letter. CitiMortgage followed up by faxing a letter to Patterson stating that the “corrected” net payout amount was $423,940. . All of that occurred on closing day. The next day CitiMortgage received a letter from Patterson demanding that it accept the $113,968.45 payment because, he insisted, that was the amount CitiMort-gage had -agreed to accept for the house.

For reasons that remain unclear, Citi-Mortgage took no action for more than two years. Then, in December 2010, CitiMort-gage began foreclosure proceedings on the Breedlove property. Patterson and Breedlove responded by filing a complaint in state court against CitiMortgage and Mortgage Systems. They asserted claims for wrongful foreclosure, breach of contract, and tortious interference with contractual relationship, and sought damages and other equitable relief. CitiMortgage and Mortgage Systems removed the case to federal district court based on diversity and later filed a motion for summary judgment. The district court ultimately granted summary judgment in favor of both of them on all of the claims.

II.

The dispositive issue is whether Citi-Mortgage’s unilateral mistake, the clerical error in its September 19, 2008 letter about the amount of the net payout it was seeking, prevented the parties from, forming a valid contract, We review de novo the district court’s grant of summary, judgment, “considering all of the evidence and the inferences it may yield in , the., light most favorable to the nonmoving party.” Ellis v. England, 432 F.3d 1321, 1325 (11th Cir.2005).

As a' threshold matter, Patterson and Breedlove contend that we may not consider the clerical error, or the circumstances leading up to the September 19 letter, because the proof of it is dependent on inadmissible parol evidence. Under Georgia law, however, parol evidence is admissible “to show no valid agreement ever went into existence.”’ BellSouth Advert. & Publ’g Corp. v. McCollum, 209 Ga.App. 441, 433 S.E.2d 437, 440 (1993) (quotation marks and citation omitted); see also Cox Broad. Corp. v. Nat’l Collegiate Athletic Ass’n, 250 Ga. 391, 297 S.E.2d 733, 737 (1982), It is also admissible “to prove that a written term in a contract was a mistake,” Nguyen v. Talisman Roswell, LLC, 262 Ga.App. 480, 585 S.E.2d 911, 912 (2003); see also Helton v. Jasper Banking Co., 311 Ga.App. 363, 715 S.E.2d 765, 767 (2011). Those are exactly the purposes for which the parol evidence was used in this case.

Patterson and Breedlove next contend that even if parol evidence is admissible, CitiMortgage’s clerical error did not prevent the formation of a valid contract. They argue that, under Georgia law, a court may not rescind a contract based on a unilateral mistake.

It is true that Georgia courts will often refuse to save contracting parties from their own unilateral mistakes that could have been avoided through the exercise of due diligence. See Decision One Mortg. Co. v. Victor Warren Props., Inc., 304 Ga.App. 423, 696 S.E.2d 145, 147-48 (2010); Frazier Assocs. Mfrs. Representatives, Inc. v. Dabbs & Stewart, 173 Ga.App. 304, 325 S.E.2d 914, 916 (1985). But it is equally true, if not more so, that Georgia courts will1 not permit a party to take unfair advantage of an offer that contains an obvious, unilateral mistake. As the Georgia Supreme Court explained more than a century ago, “There is no disposition in the law to let one -‘snap up’ another, or take an advantage of mistakes.” Singer v. Grand Rapids Match Co., 117 Ga. 86, 43 S.E. 755, 757 (1903).1 Georgia courts will rescind or refuse to enforce a contract when “one of the -parties has, without gross fault or laches on his part, made a mistake,” the mistake “was known, or ought to have been known, to the opposite party,” and “the mistake can be relieved against without injustice.”. Id. Under those circumstances, a unilateral mistake “may be a ground for rescinding a contract, or for refusing to enforce its specific performance." Werner v. Rawson, 89 Ga. 619, 15 S.E. 813, 814 (1892); see also Ga. Code § 23-2-31 (“Equity ... may rescind and cancel [a written .contract] upon the ground of mistake of fact material to the contract of one party only.”).

If Patterson was unaware that CitiMort-gage’s September 19 offer was a mistake, then CitiMortgage should suffer the loss. Frazier Assocs., 325 S.E.2d at 916. “On the other hand if [CitiMortgage] inadvertently (though negligently) made an obvious mistake and this mistake was apparent on the face of the offer and was known to [Patterson], then relief should'[be] granted to [CitiMortgage]____” Id.

Given the parties’ negotiations and Patterson’s series of escalating offers, Citi-Mortgage’s mistake was obvious and Patterson knew or should have known it was a mistake. See Singer, 43 S.E. at 757. Patterson made successive offers of $371,000 and $412,000, which would have generated net payouts to CitiMortgage in the amounts of $350,000 arid $391,940, respectively. CitiMortgage rejected both of those offers without'making a counteroffer. Then Patterson offered $444,000, which would have generated a net payout of $412,620. In response to that highest offer from Patterson,' CitiMortgage sent the September Í9 letter counteroffering for a net payout to it of $113,968.45. No rational person would believe that was anything but a mistake because rational persons and mortgagé cornpanies do not counteroffer for less — in this case nearly $300,000 less — than the latest and highest and still outstanding offer.

Patterson and Breedlove will not suffer an injustice under Georgia law because they will only be deprived of what Georgia law does not allow them to have — in Patterson’s case the opportunity to take advantage of another’s obvious unilateral mistake; in Breedlove’s case the opportunity to retain mortgaged property after he defaulted on the underlying loan. The breach of contract claims fail.

The only remaining claim, which is asserted jointly by Patterson and Breed-love, is for wrongful foreclosure by Citi-Mortgage. To establish wrongful foreclosure under Georgia law, a plaintiff must establish “a legal duty owed to it by the foreclosing party, a breach of that duty, a causal connection between the breach of that duty and the injury it sustained, and damages.” DeGolyer v. Green Tree Servicing, LLC, 291 Ga.App. 444, 662 S.E.2d 141, 147 (2008) (quotation marks omitted). The only source of a duty by CitiMortgage not to foreclose that Patterson and Breed-love point to is its September 19 letter. Because that letter did not lead to formation of a valid contract, CitiMortgage did not have any duty not to foreclose on the property. Hence the wrongful foreclosure claim fails.

AFFIRMED. 
      
      . Patterson and Breedlove acknowledge that the Georgia Supreme Court’s decision in You v. JP Morgan Chase Bank, N.A., 293 Ga. 67, 743 S.E.2d 428 (2013), forecloses their claim for wrongful foreclosure against Mortgage Systems, but they purport to "reserve their argument for why [You ] is wrong.” We, of course, never second guess state supreme court decisions about state law. See Fid. Union Tr. Co. v. Field, 311 U.S. 169, 177, 61 S.Ct. 176, 178, 85 L.Ed. 109 (1940) ("The highest state court is' the final authority on state law.... ”).
      Patterson and Breedlove also state in passing that the district court erred in granting summary judgment on their claim for tortious interference with contractual relations and their requests for other forms of relief. However, by failing to flesh out any argument about those issues they have abandoned them. See United States v. Woods, 684 F.3d 1045, 1064 n. 23 (11th Cir.2012).
     
      
      . During oral argument counsel for CitiMort-gage agreed that CitiMortgage would not attempt to pursue post-judgment interest or penalties against Breedlove. Under the peculiar. circumstances of this case it would be inequitable for CitiMortgage to do that to Breedlove and the district court should ensure that it does not do so. See Ga.Code § 23-1-3 (“Equity jurisdiction is established and allowed for the protection and relief of parties where, from any peculiar circumstances, the operation of the general rules of law would be deficient in protecting from anticipated wrong or relieving for injuries done.”); Ga.Code § 23-4-31 ("A superior court shall have full power to mold its decrees so as to meet the exigencies of each case and shall have full power to enforce its decrees when rendered.”); Goode v. Mountain Lake Invs., LLC, 271 Ga. 722, 524 S.E.2d 229, 231-32 (1999) (discussing trial courts' “broad discretion to fashion equitable remedies based upon the exigencies of each case”); see also Mitsubishi Int’l Corp. v. Cardinal Textile Sales, Inc., 14 F.3d 1507, 1518 (11th Cir.1994) (describing grounds for equitable relief under Georgia law).
     