I need some advice, My mom bought a 1999 Town & Country a couple months ago…?

Not our products are guaranteed, but the seller said it had a DVD player and it worked. When he got home everything was fine, but after a few days the brakes went on, she laid them, and then my brother (who knows cars and what not), came to watch from above, found that the reader DVD system is done professionally, but that there was a DVD player and was torn. . . . When you touch one of the wires were on the ground and caught fire and ran right through the wiring in the vehicle. She had bought a brand new wiring, which when installed, the lights still wont work, the lights stay inside, even when the device is off, and most things electrical work when they want. He also took in a garage that specializes in electric cars and things looked up and said he was interested in this project! What can you do now, is there anything he can do by law?