I actually had the same problem, I was so out of it that I confirmed the zip code. I've cancelled my card, but I was hoping you could tell me how you dealt with the problem, since your post was made about a year ago I thought you might be able to help.
They have called me 7 times already! And I finally picked up today and they said they were going to send me gas cards because of my purchase with my mastercard and something about vista...def a scam!
Received 2 calls so far from this unknown number. Answered 2 call and they were called about a an order I had placed. I do not know these people nor have I placed an order.