In our city any damages resulting from a tow that is called in is not thier responsiblity. Even if they use you TIRE to pull your car away from the curb(which I saw myself, guy put the hook right into the tire and had his partner pull on the handle that activates the winch). Really suck for this to happen to you man. I hope it goes well, but if it was the police that called it in then you will have a hard time getting any money out of them. If they just towed it for shits and giggles (no police report on the call) then it is them that is in the wrong and you would have to sue them. Most likely if they are doing that(towing without cause) to you, then they are doing it to other cars and there would be more than just you to go to court with.