I bought a Jeep and the company screwed me over, so I went back and they got me into another car. They sent me a check for $2,165 which I was told could be a tax credit, or I thought it was because they screwed me over so bad. I cashed the checked and waited a while before spending the money. Three months later the dealership called and wanted the money back even though it was their mistake. Do I have to pay them back?