Trying to cancel a ADSL line for 6months

I have a terrible customer service with Telkom from the long ques in the branches to holding for 20 minutes on the customer service line. I have completed a cancellation form 3 times in the telkom branch and this was sent to the central office for processing. Feedback i have received from the branch is that they don't deal with ADSL queries , they can help me complete the form. After sending the form 3 times for cancellation and waiting for 30 days for the cancellation to take effect . I see that i am still being charged and the subscrition has not been cancelled. I don't know who to escalate the matter to. I'm not sure if it's incompetence or systems not in place, or if its delay tactics top prevent customer from n cancelling their subscriptions