If your car was improperly towed you cannot get the costs of the towing waived in that most likely a private towing company towed your vehicle and not the police department. As such, the bill of $500 or so is the towing company's bill and it wants to get paid.If you want your vehicle back, you need to pay the towing company for its charges. If you want reimbursement for the costs that you incurred for your vehicle, you need to submit a claim under your state's tort claims act to the town/city where the police officer is employed.Depending upon the claim, it may or may not be approved. If approved, you get your costs incurred to obtain the release of your car back. If the claim is denied, you need to bring a lawsuit against the police department that caused you the problems, most likely in small claims court.