Terrible customer service when you want to cancel and change spend limit without my approval

They were great when they opened the Telkom account. I requested that they change my spend limit to 0.00, they did then changed it back to R500 without my consent. So i asked that the account be cancelled. They are giving me a run around and claiming that now cause i want to cancel I have to do so myself and contact Telkom directly. The reason i used DSL to begin with was to avoid having to deal with Telkom due to their known appalling customer service record. I do not recommend Telkom or DSL. It is a mission to cancel.