Tenn. Code Ann. § 66-21-106: Penalty for failure to release

If the plaintiff, complainant, lienor or owner of any lien filed and registered pursuant to this part fails, neglects or refuses to release a lien that is satisfied, within fifteen (15) days after written demand of the defendant or lienee, such person shall be liable to the penalty prescribed for failure to release a mortgage on demand after the payment of the debt secured.

Code 1932, § 8063; T.C.A. (orig. ed.), § 64-2106.