Reserved through Orbitz with a debit card and picked up with a credit card because of their debit card policies. Their system was down so they did everything manually, approved it and I was on my way. I returned the car three days later and their computers are STILL down. They receive the car and hand write me a bill saying the card that I gave them would be charged.
The next day I look at my statements and the card I gave them has been charged. I look at my bank statement and they've also charged me a deposit for a rental on my debit card, the day after I returned the car! I called them to get it straightened out because i figure it's simple human error because of their systems being down and that they can just drop the charge on my visa.
I call them and they insist that i'm mistaken and I must have given them a visa. They look at the imprint of the card and go figure; it's the AMEX I paid for the rental with. Too bad though, they charged my debit card for it and they claim they can't do anything about it now (even though it's still pending). They also have a charge on my AMEX, so I don't have access to those funds either. The thing is; I never presented them my visa and they don't have a swipe, imprint or record of it other than via Orbitz.
The people at the counter both times were great, but the manager Albert was rude and seemed put out that I wanted him to look into this. He had someone else call me back, presumably because he didn't want to admit his mistake, and essentially tell me to call their billing department on Monday to have them charge the Amex for the final bill and they'll refund the other card in 5-7 days.
PS: the convertible I rented was beaten into the ground. Big dents all over it. Sort of took away from the feeling of renting a flashy car when it was so beat up.