I received a letter from Hertz Portugal advising that there is a balance due on a car rental from April/May 2019. This rental was paid in full via my express-b105579">American Express card, so not sure what the confusion is on this. Can you please help resolve this? Reference Invoice [protected], RA No [protected] This car rental total amount = 945.53 Euros; this was paid in full on 5/9/2019 via express-b105579">American Express credit card. Hertz Portugal claims that a balance of 170.70 Euros is still due.