Similar things have happened to me, I was parked at my apartment complex,where I had been living for 2 years and I was towed from a handicapped spot (yes I have all the proper paperwork/ and other things on my car to park there) I had to pay this towing company that didn't even have a contract with my complex $750 to get my car back. Cops didn't get involved and my lawyer got me half of my money back and after a year of trying to get the rest I just gave up. They said my plates didn't have the handicapped symbol on it, but in NH you only need a thing hanging from your mirror. It was bullshit.