Sounds like a scam to me.
Do you see a scheduled payment on your account?
Did they ask you for your bank/personal details?
I didn't login to my account but I got email about scheduled payment. They knew the total I owed on my cc, name etc. The only thing I gave them was my security pin. I didn't even give them my bank account number, I told them to charge last account I made payment from.
I got a call from 800-453-2044, is this legit Amex number?