My roomate stole my debit card! What can I do to keep the charges from coming through?

I left my debit card in my purse in our apartment. Before I even knew it was gone, my roomate hands it to me and explains that she "borrowed" it to get a Blockbuster Rental pass. In order to get the rental pass, you have to have a credit or debit card on file. Nothing was charged to my account because she... show more I left my debit card in my purse in our apartment. Before I even knew it was gone, my roomate hands it to me and explains that she "borrowed" it to get a Blockbuster Rental pass. In order to get the rental pass, you have to have a credit or debit card on file. Nothing was charged to my account because she paid cash, but if she dosn't pay the monthly fee, they will charge my debit card. Given her history of not paying bills, I don't want my card associated with anything she owes. I tried to get her to remove my card number from her account and she refused. I tried blockbuster, the manager said there was nothing they could do unless she put another card number on file, or I had proof that it was stolen. He said that there was a signature on file, so I know she ran it like a credit card so she wouldn't have to know my pin. What can I do? If I go to my bank and explain will they stop charges from blockbuster to my account?
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