I reserved and pre-paid for a rental on priceline.com. The price I agreed to and paid was $155.06. When I returned the car, I had a charge for an 'upgrade fee' of $36.80. I did not upgrade my car, in fact, I rented the exact same car from Avis about 2 weeks prior to this experience. I was running late for my flight, and did not have time to fight with them at that time. I called Customer Service, and they are unwilling to reverse the $36 charge. I have initiated a dispute with American Express for the extra $36. I hope they will... read full review »