I rented a small car with Rentalcars.com for he 10th January, 2015 until the 11th - so ONE day. The rental agency at the Brussels aiport was Hertz.
I pre-paid the car $103.00. When I returned the car after ONE day, I got another bill of $168.00 which was billed AMEX.
So my total bill for ONE day (Opel Corsa) was over $270.00.
I called both parties and NONE was willing to find out where the mistake was - in fact they did not assume thereak was a mistake.
After wasting about 2 hours trying to handle this overbilling, I had to tell them I would dispute the bills with AMEX. Both agents told me "I can understand:... but did nothing to help.