These people who say they are Card Member Services are crooks running a scam. There are many such people running this scam so don't think this is just one company or that putting your name on a do not call list will have any effect. The object of the scam is to get your name and credit card number which they will then happily use leaving you will a bill. The last thing you should do is interact with these people. Simply do not answer these calls. What I do is keep a list of such names in my dumb phone memory under IGNORExx so I know not to answer if they call back. I hear there are apps for smart phones which prevent the phone from even ringing when an ignored number calls.
Guard must have walked up and he had to hide the Cell phone! Can't afford to buy another from the guards. That hurts too bad and can't sit for a few days.