Got a call from this number yesterday,  they didn't leave a message or say anything, I am tired of getting these calls, MY number is on the DO NOT CALL LIST RECENTLY REREGISTERED.
PLEASE DO SOMETHING ABOUT THIS.

Someone called me this morning from this number saying they are calling from my bank and have some questions our my debit card. I told them i will call back. Later I called my bank and to see there is no record of anyone calling me regarding my acccount or card.

LOOKS LIKE SOME ONE TRYING TO GET HOLD OF MY DEBIT CARD INFO.

Please be careful and never anwser a call from bank or credict card companies. Tell them you will call back to the bank or credict card company by yourself. Dont take number from them to call. ONLY call the number on back of your cards.

I received a call from 203-551-5997.  The person on the other end did not say anything.  However, I tried to call them back about 10 times, and they did not answer the phone.

May 31, 2009
In my case, the caller ID said "CT" meaning Connecticut, where Mastercard is based.  The caller asked for me to call back at a toll free number 888-333-0114 (which is the anti fraud dept).  I instead went directly to my Mastercard account and called the main number and listened to the voice prompts that asked if I'd been asked to return a call or letter regarding my account.  After speaking to the customer rep about a transaction they thought looked suspicious, I asked about the above numbers and the rep verified those were legitimate Mastercard numbers.  I'd still recommend dialing the numbers on your account transaction page or on the back of the actual card.

I received a call from Jennifer with RBS anti-fraud asking me to call her back at (888) 333-0114 regarding my Mastercard. I called my Mastercard company to talk to them and they have no idea who that company is and nothing was wrong with my account. I was told not to call them back or give any information to them. They are a fraudulent company.