Ah, Amex.
We used to use them for Merchant Services, back in the day before we had any other options. When we finally dropped them for Stripe and closed our account, we continued to get emails telling us our merchant statement was ready. I called them several times about this but they were unable to find any record of an open account - no account number was on the email - so had no way of stopping the emails and suggested we "just ignore them". They eventually stopped after a couple of years.