Cold card customer for many years. Pay my bills on time as requested on hard copy invoice send by us office of amex.
During a period of time I received email messages from the Amsterdam office Netherlands.
I have let them know I don't use email for financial purpose and pay my amex bills soon as I received and checked as per hard copy.
Bills are not always correct, many times they try to charge you for payments already done.
When you contact them (by phone through the helpdesk) you have to be very patient.
Employees are very unfriendly without any knowledge, even head of the bookkeeping department.
Now they send me a invoice with a fine for bills already paid.
Other issue, when traveling a lot you find out amex are very low in popularity by store, hotels and gasstations.
Time to say goodbye too a very poor company.