Totally believable
I returned a car that had been in a minor accident and I did an accident report in the garage. Luckily a supervisor was right there and I asked her about a small scratch. She said don't worry about it and signed off on the accident report with a specific note that there was no damage to the Hertz vehicle. A couple of weeks later I get a bill for around $3k for repairs done on three sides of the car. I tried to fight on my own but all they did was wait 45 days and then have a different person harass me about it. AMEX shut the whole thing down.