MWI Homeworks Plus ripoff, they charged my debit card account, and I don't even know who they are Internet

I went to the ATM to make a withdrawal to find out I didn't have the money in there I thought I did. I went into the bank and the clerk printed a report for me. She told me MWI HOMEWORKS PLUS made a withdrawal and they're going to do so the 13th of each month, I asked her who they were because I've never heard of them, and she didn't know, she asked if I'd made a recent purchase on the internet, and I told her not that I know of. I live alone so I know nobody else did on my computer either. How do I get my money back and stop them from doing it again.

Debra
Poughkeepsie, New York
U.S.A.