of The Colony v. North Texas Mun. Water Dist., 272 S.W.3d 699, 731 (Tex.App.-Fort Worth 2008); Van Duzer v. U.S. Bank Nat. Ass’n, 995 F.Supp.2d 673, 698-99 (S.D.Tex.2014). An exception to this rule arises when overpayment is made under a valid contract. Id. and id., citing Sw. Elec. Power Co. v. Burlington N. R.R. Co., 966 S.W.2d 467, 469-70 (Tex.1998) (“in some circumstances overpayments under a valid contract may give rise to a claim for restitution or unjust enrichment”), in turn citing the following inter alia: Bowers v. Missouri, Kan. & Tex. Ry. Co., 241 S.W. 509, 510-11 (Tex.App.-Texarkana 1922, no writ) (allowing restitution for freight charges paid in excess of rates specified in shipping contract); Gulf Oil Corp. v. Lone Star Producing Co., 322 F.2d 28, 31-33 (5th Cir.1963) (<HOLDING>); Natural Gas Pipeline Co. v. Harrington, 246
holding that plaintiff could recover money mistakenly paid in excess of contract price holding that a contract must entitle the plaintiff to money damages in the event of the governments breach of that contract holding that attorneys could not recover fees in excess of amount billed holding that plaintiff could recover medical fees not actually paid by the insurance company pursuant to an insurance contract holding contract for sale of water which did not specify price was unenforceable because price of water was essence of contract