This is a wide spread scam for a "$1000 Walmart Gift Card".
The domain promocenter.ws is registered here:
http://www.bigrock.com/support/contact-us.php
Go and file a complaint, maybe we can get their domain shut down.
received last wed. the only ppl who could have known the number were walmart (ordered photos) and a site i ordered books from. narrows down how they got the number.