This just happened to me 2 weeks ago. I bought a card and the DC says it was delivered but I never got it. I waited for almost a week hoping that it just got misplaced in the mail truck or something, but it still hasn't shown up. I called my PO and gave them my information, and I'm still waiting for them to call me back. Good thing it was only a $20 card.
Heath Miller PC - http://s40.photobucket.com/albums/e206/mstng99tim/HEATH%20MILLER%20RC%20COLLECTION/?start=all
Pitt Panthers PC - http://s40.photobucket.com/user/mstng99tim/library/Personal%20Collection/PITT