I bought a car from a used car lot sold as is. Before even saying I wanted the car I informed them the passenger front electrical window did not work the salesman I was talking to assured me they would fix it at no cost to me. We signed papers and I drove the car home. I took the car back several time to get the window fixed and they told me they didn't have to part to make the repair now I am being told to much time has passed. What can I do about this?