Smart Finance Sold me a over priced lemon Knoxville Tennessee

First off they ripped me off on the price of the car it isn't worth 6,000 and they charged me 14,000 within 6 months of having it check engine light came on and the sensor for the tires and of course not covered in there so called warranty then heat,air, and no defrost stopped working. I changed the blow motor, resistor, climate control panel and still didn't fix it. i was told electrical or the computer board, I was also told by another mechanic that no one should put after market things on it should be done by factory so that you know that they have it rigged. if your 2 day's late on a payment the alarm goes of and they shut down your car. I was at work til 2 in the morning and went to leave and my car wouldn't start so they don't care about safety for one but I believe the crap they have on these cars are messing up the computer board's. my payments are higher than a new car payment .I tried to trade it but the other place said they seen you coming and that Smart auto took advantage of you .so I'm stuck with a car no one wants, don't buy from them ,once I can afford it I'm having the car checked out and probably getting a lawyer to sue them.