I received this report by email. it may have been reported before but if not here it is. I have condensed it from the original
You may receive a call purporting to be from your Credit Card supplier. They will know your name and address etc. and will say something like they are checking on a possible fraudulent purchase using your account. They will ramble on and eventually say they want to check if you still have your card and in order for you to prove it will ask for the numbers on the back. Do not give out these numbers. Put the phone down and, if you wish, report the event to your Credit Card supplier.