These guys keep on deducting an amount of R275. Membership fees. I'm no member.

I cancelled my contract with these people within 5 days after signing up with them. I literally had to go to their offices in Durbanville for a refund on my credit card after cancelling through a letter. Now after 4 years they still deduct membership fees. How do i stop them. I feel I'll do something irresponsible since i know where their offices are.