poor service

We bought a car that came from an accident. It was returned back to the dealership in less then a week of purchase because we didn't know it was from an accident . We we're promised another car of it's value the day came for collected guess what No car. We asked for our money back that we paid cash and we were given the run around up until we demand a letter in writing of when will we get our money or a car. Now the we are once again here after 30 working days to collect what is ours they clam they do not have the money they promised the car they want to give is has a problem if it drives a long distance it will over heat. They are unprofessional they are wasting our time and they are getting rich of others peoples misery. They have a one hundred thousand of ours they they are not doing anything to give it back.