They've called me over 15 times the past 2 weeks. I answer, and they hang up. I call back, and I get an automated message saying they're American Express. Not only do I NOT have an American Express card, I don't live in NC.
II believe this number to be misleading and being used in a criminal manner. It claims to be American Express are immediately requests for your account #. Discard and report if your the next victim.