150.15. If, following a notice of repossession, the voluntary return or forced repossession of the goods is effected, the contract is rescinded of right from the date of such return.
The merchant is not, in such a case, bound to return the amount of the payments due he has already received, and he cannot claim any damages other than those actually resulting, directly and immediately, from the rescission of the contract.
The merchant is bound to minimize his damages.