general problems of the 2008 Dodge Caliber

I bought a used 2008 Dodge Caliber with 14,100 miles on it. The tires weren't right from the night I brought it home. I called and complained, the dealership said that they put new brakes on it and to give it a few days to see if it would get better. It did not, I still had a pulsing or thumping noise in the front end. I took it back, they said nothing was wrong with it. I asked about the tires and I was told "the tires passed inspection". I took my car to a friend who rotated and balanced the tires, and was told I had a bad tire, it wasn't round or something like that. The bad tire then went on the back passenger side. I then called the dealership and told them what I did, they were angry and said nothing was mechanically wrong with the car and again the tires had passed inspection. After much arguing they agreed to either put on 4 new tires at half the cost to me or put on another used tire. I chose to have another used tire put on. The car now pulses or thumps on the front passenger side. I didn't get 5 miles up the road and it started all over again. The service manager told me that Calibers are known for "chopping tires" and if I got new tires to make sure they are rotated without fail every 6k miles. I didn't even call the dealership back about the noise. I sent in a form complaining that the noise was not resolved. They were horrible to even talk to, they said tires were not under warranty and the 1/2 off the tires was a one time offer. I like my car but I can't stand the thumping noise the tires make. If the car is known to do this why isn't something being done to correct it?? because I bought this car at a rock bottom price I can't expect to have new tires on the car and I have to basically live with it I was told so that is why I am complaining. I paid a little over $10000. For this car and it is new to me, I still have the balance of the factory warranty left on the car. It's a nice car to me and it is a lot of money to me. I just wanted someone to know.