[Ripped Off]

I had the misfortune of renting from Enterprise last month in Southern California.
Firstly, the car I reserved was not available, I was offered a POS Chevy Cobalt with 38K miles. I drove this car 1 day and returned it in trade for another.
Upon my return, the attendant found damage that apparently did not exist when I received the car. He said the care looked like it had been vandalized.
This is patently false. I parked in my garage overnight and at my office is aside the sheriff's station. Needless to say, there is no crime either in my garage or at the office.
I've cried foul and run my complaint up the chain of command but it has fallen on deaf ears.
The assistant manager (lets call him "T") has admitted to me that his cars get jacked with all the time in his lot.
The branch manager (This guy is "T" as well) admitted that although promotions and pay are performance based, his people would never try to fix a car on someone else's dime. Additionally, he did not return my phone calls and I had to hunt him down.
The area manager (JP) also does not return calls, is rude, will interupt you in a phone call, and does not read reports so I think he just likes to hear himself talk.
In Summary, can anyone give me some advice on what I can do? It would be faster to burn the money than give it to ERAC for damange that didn't happen when the car was in my posession.