The mistake I did was I gave my card details and I stopped going after months because of the change in office timings, but they charged for 3rd month also. Later I had to cancel my card itself.
Even after cancelling the card they kept on calling me to pay the fees and threatening me that if I don’t pay they will black list me or take legal action against me. But I said I wont pay and asked them to do what ever they want, because I knew how to handle if something goes wrong.