I signed up the membership in True Fitness yesterday, Joining fee: RM 140, Processing Fee: RM 50, Monthly fee: RM 99.00, two years agreement

Its expensive, but i need it, so i jus signed it up

I din give them my credit card details, cos i insisted to pay in cash every month

But yesterday due to the processing fee and joining fee, i have to pay by credit cards as i dun have much cash with me.

I am wondering, if i only swipe my card for particular transaction yesterday, can they just take my card numbers and do monthly direct debit quietly?