I was involved in an accident very recently. As I was taking photos of the accident, a gentleman in a AAA truck stopped,

Customer: I was involved in an accident very recently. As I was taking photos of the accident, a gentleman in a AAA truck stopped, checked out cars and told us that we should move the car off of the freeway. He told me that he works with BMW, and that BMW Roadside provides free towing for this scenario. I currently am covered under BMW Roadside, and seeing that he was from AAA, I thought that maybe BMW in the area was contracted with AAA. My adrenaline was through the roof at this time.We exited the freeway, and as soon as we exited, he inspected out cars and advised us against driving and said that the tow trucks were on their way to take out cars to a shop. They take my car to the shop, and a representative comes out and said Hi my name is ***** ***** work with ___ bmw dealership. I was super shaken by the accident still, and I knew that many BMW dealerships in the area actually partner with collision centers in the area. He said everything will be ok, tells me to call insurance and says we'll leave the car here and that they would get an estimate next week after we deal with insurance. They have yet to do anything to my car at this point. Before I leave, he says that no work will be done till next week and that they will let me know what's wrong with my car next week, hands me a contract to sign, so I sign it (Stupid I know, but I had just been in an accident 40 mins prior)I go home, and after calming down for a while, I call BMW Roadside and explained the situation. They tell me they are not connected with AAA in any way, and they always tow cars to a BMW collision center. They offered to tow my car out of the shop and to a legitimate collision center. I call up another representative and am informed that the auto body shop does not work with the bmw dealership, rather, they purchase parts from them.I got super worried, and I go look at the contract I signed. On the contract it says towing was 600$, storage was 200 a day and a 500$ authorization to tear down, along with other expenses totaling almost 2000$. I never called them to tow me (they showed up said they were from bmw) , and they have yet to tear down/inspect my vehicleI am going in tomorrow to ask them to not touch my vehicle and to give it back, but I have no idea what to expect and what to do. Is this something i can get the police involved with? What if they refuse to give my vehicle until I pay them for towing (600$) for maybe 2 miles and storage fees of 200$ a day. What kind of attorney should i seek out? All I want is to have my car back.