I purchased a used car & day 4 it stopped running.?

I bought a used car at an established dealership. It is a 2002 Ford Escape. I paid $6000 cash for it. I got a limited 30 day power train warranty. I bought the car Tuesday night and on Saturday morning it would not start. I had the vehicle towed back to Axelrod Chrysler Plymouth in Parma, Ohio and I expected them to do the right thing. I just bought the car three days earlier. Well, they told me that I would have to pay for the repair (probably a fuel pump). Instead of giving me a loaner car because their Ford mechanic would not be in until Monday, they told me to go up the street to Enterprise and rent a car at my own expense!!!!! Am I crazy to have expected them to take care of everything at no cost to me? I gave them $6000 three days ago and they want me to spend another $30 a day to rent a car???!!!! What can I do? What would u do? I might as well have bought the car at some Joe Schmoe out of the newspaper. I gave them ALL of my money. I did not expect to have to pay a big repair bill so soon. I am a single mother of three and I work full time and go to school full time!! Now I have no transportation!