That's the best background info yet! It certainly sounds like a scam to steal your credit card information by having you volunteer to give it away. Social engineering conning at its best.
The person on the other end of the line didn't happen to have a Nigerian accent, did they?... ;->
I got a call a short while ago from (484) 489-0922. no msg was left. after reading your posts, I'm glad I didn't get up to go to my phone across the room. Thanks for sharing.