American Express Dispute

I've just got into a dispute with American Express. I was a day late making a payment of £403.75 against an American Express Platinum credit card. They've charged me £23.52. By my reckoning that's 5.83% for one day!!! On an annualised interest basis the charge is preposterous. Even if I ignore the £12 late payment fee, the interest fee is still £11.52, which works out at 2.85% for 1 day's delay.

This is the first time I've missed a payment with them. Needless to say I have told Amex I'm cancelling their card. Obviously American Express must factor in the sort of response I've made. Good luck to them. They won't get my custom ever again.