Hi!

I had reservation for Avis car booked via AmEx - my confirmation papers says unlimited mileage per day. After I took the the car - papers were saying 0.30 cents per mile. I have asked a question at the pick-up station - folks were saying "well, we can't do anything here". At the return location I had the same story.

What's the effective way to escalate this? I'm still on the road, so I would obviously call AmEx later, but is there any number to call Avis?