Overnight Genius Never ordered product, yet shipped and billed Boulder, Colorado

My husband started receiving these weird "how to" videos for Microsoft Windows that he never requested and had never heard of. After the second shipment, I noticed a strange pending charge on his debit account, so I googled the phone number (since the dvds never came with a company name/phone number/invoice). Overnight Genius came up online. At about $80 per charge, he called today, conveniently enough after a new charge was pending for the previous day (that makes 3 total). He was told that the order was placed online on a certain day and time that he could not possibly have been in front of a computer and was told that his security code was also used from his debit card..now I'd like to see them prove that. In any case, they will only refund him one of the payments, and wouldn't you know it was the one that was the cheapest (I guess without $5 postage).
Who are these people and how did they get my husbands debit card number? Does the bank accept these charges without the actual security code, b/c I'd be inclined to believe they do. And since it's a debit card and not a credit card, my husband cannot seek resititution with the financial institution that issues his debit card.

Karletay
Chevy Chase, Maryland
U.S.A.