(a) Every contract for dance studio services shall provide that such contract may be cancelled by written notice to the dance studio; that all moneys paid pursuant to such contract shall be refunded within 30 days of receipt of the cancellation notice, except that the customer is liable to the studio for any services received prior to cancellation, and except that if cancellation is sent more than 30 days after the contract is signed by the customer, the customer is further liable to the studio for 10% of the unused balance, or $50, whichever is less; and that cancellation shall be by registered or certified mail return receipt requested to the address specified in the contract.
     (b) Every contract for dance studio services shall provide that if, by reason of death or disability, the customer is unable to receive all services contracted for, the customer, or his estate as the case may be, shall be relieved from the obligation of making payment for services other than those received prior to death or the onset of disability; and that if such customer has prepaid any sum for services, so much of such sum as is allocable to services not received shall be refunded within 30 days of receipt by the dance studio of reasonable evidence of such disability or death.