What finance charges?
It would be good Mary, if you gave Amex a call?
They probably mischarged you? Its always better to call and clear up the air.

Amex has exceptional value and expertise.
I love my Amex. They have on occasion disappointed me in that their RM had had a bad hair day, if that is the case, I apologise and end the conversation, and make in another call and talk to more friendly RMs.

Its the same with other CC issuers, if a RM is not to your liking, just end the call and get some other RM to take care of your matters.