Tenn. Code Ann. § 47-18-5525: Voidable agreements

(a) If a provider imposes a fee or other charge or receives money or other payments not authorized by § 47-18-5523 or § 47-18-5524 , the individual may void the agreement and recover as provided in § 47-18-5535 .

(b) If a provider is not registered as required by this part when an individual assents to an agreement, the agreement is voidable by the individual.

(c) If an individual voids an agreement under subsection (b), the provider does not have a claim against the individual for breach of contract or for restitution.