This is one of several numbers that have come up on my caller ID, which have come from American Express. They keep calling to collect a debt I do not owe on a "blue card," which I do not have. I contacted the American Express number on the back of my Platinum card, and have complained several times. They have put notes all over the computer saying that I am not the person they are looking for, and have even called one of the numbers and told them this and have told them to stop calling me - and yet still the calls continue! This morning, they even called my cell phone! They do not seem to understand the concept of more than one person having the same name, and so they apparently contact everyone in the country who has the same name as the person they are looking for - and they don't stop calling - EVER!
Actually, it is American Express. I initially had the same suspicions as you, and when I first called the number for American Express that is on the back of my card, they said it wasn't one of their numbers. But the calls continued, so I called them again and asked if they could contact the number to see if it was legitimate. They were able to confirm that it was one of the phone numbers for their Account Services department. They were able to confirm also that I was not the person they were looking for and they even put notes to that effect all over the computer. Unfortunately, the calls have continued - and this morning they even had the nerve to call my cell phone! It's absolutely maddening! If I wasn't a customer, I might be able to sue them for annoying me like this. Still, I'm documenting every call, and if it comes down to it, I will sue them for the times they have made me late for work with this nonsense, putting my job in jeopardy. I've had it with these jerks!
I got the same called from the same guy with an accent. When I called back he picked up, I asked him to remove my number from their calling list and that was the end of that. I did not give any card information or ask why they were calling, I told him I did not have an account (which I do but after reading all these posts can see its a scam) he promised I would get no more calls. My Amex account is in good standing so there would be no reason to call me and especially at work, I do not think I gave my work account to Amex.