Gym Company is ********ly taking money!!

Somehow my old gym Fitextreme sold my month to month to the Gym Company without my concent. I didn't like the gym and wanted to cancel the contract, but its been months trying to cancel and they keep on deducting money from my account. Now stating that I have to pay R1900 to buy myself out of a contract I didn't even signed!!! Watch out for this company, they don't have any integrity!