maga motor (T) would give real name sold me a limon and has sent my mechanic a letter claiming the car is stolen car broke down a week after I buought it dallas Texas

I had bought a car from mega motors on the 1st of this month by the 7th on my way to Austin the car breaks down I tried to put it in the shop and get it fixed but its gonna cost me more I think the car is worth I call the mega motors and explain to them my situation and they tell me did I should have to get out of Dallas before I bought the vehicle I explain to them that I needed a vehicle to get back and forth from Dallas in Austin Im from austinn but I go to school in Dallas now they have sent a letter to my mechanic claiming that that car has been reported stolen accusing me I'm stealing a vehicle did I put a down payment on I tried to call him and question them about the accusation and have tried to get names of the people that was talking to you and they're all refusing to give me a full namei dont know who to turn to for help I feel I have been robbed for my money