Cancellation sent in as per procedure and still Telkom is taking premiums

My Telkom Wifi contact ended Feb 2018, I submitted the signed cancellation formt at Mall at Reds in Centurion. And then beginning of February 2018 went back to Mall at Reds because got a statement that I owe a premium for March 2018. But my last premium had to be deducted 6th February 2018. Got case number ********** 3 and the billing consultant said I must email him at ********** and will respond and assist with the fault. Because as he explained Telkom forgot to process the cancellation. therefore they requested another premium for March. Then they took the premium and I reversed the payment then I got a penalty fee to pay.

6th April I went to Forest Hill telkom and Blessing logged another inquiry because the above consultant closed the above inquiry without resolving the issue. The new inquiry number logged by Blessing is ********** 5, and she said she would call me to keep me updated and nothing at all. Then last week 14th April went back to Mall @ reds and the consultant said no one has touched the inquiry. I have been trying to call the billing department but no one answers - I cannot stay on the line for 20min with no answer

I was warned that Telkom will still take premiums from me after I followed the correct procedure for cancellations. I am furious and need help!!