This may be a version of the automatic debit scam as described by the FTC here http://www.ftc.gov/bcp/edu/pubs/consumer/telemarketing/tel06.shtm To get your freebie/winnings/whatever, the scammers want your card to charge for shipping but buried in the fine print is authorization to charge your card every billing cycle with bullsh*t difficult-to-cancel subscriptions. Your bank may decline to refund charges even though you were unaware of it. Report to the Internet Crime Complaint Center http://www.ic3.gov/complaint/default.aspx , the Federal Communications Commission http://esupport.fcc.gov/complaints.htm , the Federal Trade Commission https://www.ftccomplaintassistant.gov/ and your state AG http://www.naag.org/current-attorneys-general.php as appropriate.
Rang once and hung up. Called them back and got an automated system claiming I had recently visited one of their affiliated sites and they had a debit card for me as a reward.
Seems how I am at work I don't know what affiliated website they are talking about. Did not bother holding.