Prime Auto connection

I purchased a truck from this business a couple of weeks it started having issues I contacted the dealer they asked that I bring it they took a look ans said white smoke was blowing out and that was possibly due to Anti-Freeze getting in the motor they fixed a couple of things gave me a rental while they were fixing my truck that started on fire when I started the car, then they left it in my drive way for almost a week. I got my truck back still had issues had been in contact with the dealer the entire time. Three weeks later my engine blows I had purchased a warranty through the company the dealer said don't worry it will be covered will guess what it's not. I called the dealer and they said they would help me take care of this cause they take care of their customers we had a three way call with the general manage,mechanic and myself the general manager told us both they would cover most of the cost and I would pay a little portion well guess what they said they will no longer pay I am out my truck that I make payments on and the mechanic is also out the money as well not sure if any one can help but I think this business needs to looked into for selling bad cars and taking advantage of people.