Fraudulant phone call: There was a message from “American Express” saying I should return the call asap.  They apologized for any inconvenience that it might cause me but I needed to call if they were to continue doing business with me.  Then they  gave me this number to call: 1.800 494-0128 and a case reference #. The recording gave their working hours as Mon - Fri,7am to 8pm MTS, or 9am to 6pm EST.
When I dialed that number, it rang once and then transferred to another number.  That one picked up and said ‘the number you have dialed has a new national directory assistance service. Please dial 10 15 15 800. You will be charged $5.49 for this call.’
I called American Express directly and was told it was a fraudulent call and that they are open 24/7.

I got a call from that number as well and I, too, was connected to my bank to verify my address and account number.  I followed up by calling American Express after the call; they CONFIRMED that the call did indeed come from their Salt Lake City office.  I hope that's helpful.

a call came in from 801-945-5000, but when i aswered the called just ended. No one talked.

a call came from this (801-945-5000) number and said its verification of application for American Express credit card,  i had applied for the card few days back over net, so when they asked my address and last 4 digits of SSN i provided it but then they wanted my bank account number for my address verification, i did n't give it , then they said they will send a postal mail and i can return with a utility bill copy as address verification, i find it a bit funny , they could have instead send me a mail and then asked me to call the amex bank number to verify or so

Got a call from 801-945-5000.  I didn't answer as it called my cell phone. After reading replies here, I need to say that I have NOT applied with american express and have not applied and have no credit cards with them.  There is no reason for them to call me.