Bought a car there and services done to car

Do not do business here. I bought a car and went to get the title for it, it was rebuilt, but he neglected to tell me this. It is illegal to sell a car that doesn't belong to you, and not to tell the seller that it has a rebuilt title. Pursuing criminal actions. Also, he did some work to the car, as a mechanic shop, and when things weren't working right, I took the car to a dealer, and found the fuel level sensor laying in the bottom of the gas tank, etc....What kind of mechanic shop is this? Be wary.....