Mich. Comp. Laws § 445.1403: Payment in full; acknowledgment, release of collateral.

Sec. 403.

After the payment of all sums for which the buyer is obligated under a home improvement installment contract and upon demand made by the buyer, the holder shall deliver, or mail to the buyer at his last known address, such 1 or more good and sufficient instruments as may be necessary to acknowledge payment in full and to release all collateral.