Report unethical business practice of towing company?

My car was towed(another entry reporting condo management company for illegal tow) I inherited the car when my father recently passed away. My inheritence is a Trust The car cannot be titled to a trust so it was titled in the family name for example The Smith Group. I showed the the Towing company The Trust documents making me trustee, The Death Certificate,My Father's driver's license, the insurance card showing my Father as the owner of the car, my driver's license proving I am the trustee and I had the keys to the car. The towing company would not release my car to me insisting that I couldn't prove the car was mine!!! They want me to prove that I am an officer of the "Smith Group" which I can not I can and did prove that my father was the owner and that I now am the trustee of his estate including the car. I believe they are trying to steal the car from me. It is a vintage Cadillac and I am beside myself what should I do?