I think Amex is VERY customer friendly
I was ripped off by a taxi driver in CPH. The taxi ride should not have been more than $20. MAX....After taking me on a "tour" from the Radisson, back out towards the airport, around the ring road, past the RR station, etc etc he finally brought me to the pier at a cost of $64. I was going to pay cash, but knew I would never have any recourse so I put it on Amex. Got home, called them, and they brought the charge down to $20. with no additional info requested. I was prepared to write a letter and give all the details and back up but it was not even requested. I thought that was great. The $44. credit was on my next statement.