Wozo.com LLC Keeps trying to take money Boston Massachusetts

These people keep trying to take money out of my debit card and I dont know who they are and when called they say I signed a contract with them. Needless to say I dont keep money on my card anymore. Someone needs to do something about these people they cannot be in the right I see where several people have been scammed why wont anyone do anything about them I havent lost money to them but I cant have any money on my card either cause they will just take it. Can a laywer or somone please stop these guys they offer a product but you never recieve it and they keep trying to take more and more money that is a crime if Im not misteaken