We rented a mini van from thrifty in frankfurt airport, germany May 2011
When we got there, we had our own premium car rental insurance from american express, they rejected it. They said we could only buy insurance from them, otherwise, they won't let us drive out their car.
Leave no choice, we bought the super expensive insurance from them, which was 25 eur a day.
The trip was going smoothly, nothing happened to the car, after we returned it to their parking lot, there is no person around. We dropped the key and went to their rental office. The people there told us just to leave the car there, they will check later and return us the deposit to my credit card which was eur 1100

after we came back to US, I didn't get the deposit back, I tried to contact them, called, left messages, wrote letters. no reply. After a week, finally, I reached them, They said the car was damaged! And they won't return me the deposit!!!

I was really angry, plus after came back to USA, I did some research, found out that thrifty car rental frankfurk has already scammed a lot of people's deposit. So, I called my credit card company, disputing the charges.

While it was still in disputing, they charged me another $2500. they explained that since there was no policy report, the insurance was voided. And the repair for the damage was 3000 euro. They charged the leftover through my account without any notifications.

I called them, telling them that there was no damage to the car at all during our trip. how come they charged us for the repair. Now it is still in disputing.