So i brought my car in for a simple oil change. When I picked my car up I was about 2 minutes down the highway when I started hearing and feeling a very loud and hard banging. I pulled over thinking I had a flat tire, nothing. I started driving slowly through the parking lot and it was doing it still, hung my head out the window to see my rim pretty much sliding on and off the car. So I stop and look and my lug nuts are on the rim only by a hair, not even finger tight.I called the mechanic and told them what happened and they just told me to jack it up and tighten them myself. I dont have a jack or anything so I demanded they come to where i was and them do it. They came up there and tightened them me. They wanted me to bring the car back up there the next day so they could see if any damage was done. I pointed out to them right then and there all the shredded metal that was around the rim and I said youor damn right you did some damage. I brought it up there and they called me said it was fine no damage done. I can feel it when im driving the car that somethings not right. Took the rim off myself and there is obvious damage to it and I know its affecting how the car drives. These are custom rims that I payed 3k for. I havent said anything to the shop yet. What kind of legal action can I take?