AutoNation Ford Frisco

I purchase a 2013 Ford Focus. After having it a couple of days, I noticed the transmission wasn't shiffting correctly. I called the dealership and was told to bring it in. So I took it in Tuesday night. My last night I had to change my mind about wanting the vehicle. When the salesman who sold me the car and a service guy both told me its 4 cylinder it's just the way it is. Well they gave me another Ford Focus as a rental car and it didn't do the same thing. I get a call Thursday night saying the clutch in the transmission was bad. I said well you can keep the car. I'll be in Friday after work to get my car. I worked with the interner sales manager to get my car back, who told me that the focus is a great car except for their transmissions and engines. So I get my car back. They show me a bill saying they put over $900 worth of work into my car and asked me to help pay some of the work they did. Why should I have to? I took the focus back with in the 3 day limit. They shouldn't of touched my car. The Internet sales manager asked me 3 times if I'm sure that's what I want to do, get my old car back. He kept trying to have me keep the car saying they are great cars. Even though 30 minutes before telling me how bad their transmissions and engines are. Now I'm out $500 and waiting for my title to come back so I can go to a different dealer and stay away from ford. To top it off it was a pre certified owned vehicle and should of been checked out.