Changing Your Mind FAQs Does cashing a check marked "paid in full" mean I can't collect the balance still owed? Can a used car buyer get his money back for a problem with the car that he didn't notice until after the purchase? Can I change my mind after entering a contract? Do I have to accept a store credit if the store refund policy states that no cash refunds will be issued? Do I have to pay a reward I offered for a lost item if I think the person who returned it stole it?