Shame on you for telling people they have won, when they didn't. And from what i can understand you ask for a credit card? BULL [***]. What nerve you have when it seems there's no winning at all.
You never pay for something you win. if you win you don't pay a dime EVER.
So shame these persons, who are probably trying to make a free buck, with no intention of delivering.
"Your latest entry into our contest has made you a winner! Goto http://bit.ly/KHdZog to claim your iPad 2, enter code 9877 to qualify. Claim before 5-3-12."