Owner is trying to back out from an approved short-sale transaction by claiming that 1. he has not deposited earnest money, although we had the receipt from escrow company acknowledging receiving the check 2. he has not signed lender's approval letter and has not agreed to all short-sale terms. I have performed everything required so far by giving earnest money deposit, doing inspections. What could I do to stop him from doing it and putting property back to market? I am in california san diego.