Can my transmission be damaged from being towed improperly?

What is your question?

My volvo has 120,000 miles and experienced transmission damages after being towed, what I believe was improperly (from behind while the car was in park), because the location of my parking permit changed with out me being properly notified. I believe the two events are related, yet there is no "proof" and the towing company is refusing to pay for it. I have an invoice with the parts that were replaced, and the towing company says it is from "normal wear and tear" but it seems like a stretch. I am wondering if 120,000 miles is "normal" for transmissions to have issues. My car has been taken care of since I owned it, so it seems very strange, as my family has always had volvos that hit over 200,000 miles with no problems. Parts that had to be replaced include the torque converter, valve body, shift solenoid, transmission pump. Please let me know if this can some how be argued that it was from towing, as I really believe it was and don't think that my failure to be notified properly is a reason for me to be out $2500.