Telkom Bluff - Worst Employees - Unhelpful - Rude

I cancelled my adsl in October 2017 -Filled in a cancellation form, The branch took the original and gave me a copy. January 30th 2018 and I am still being billed secretly as no invoice ever reached me. By pure luck I phoned them to ensure there is nothing on my name yet I was still being billed. Stood in the line for an hour at bluff only to be told by the 2 rude ladies that they do not keep copies of the cancellation form and I need to fetch my copy(I already disposed of my copy as I was at that time already furious with their poor service). I am now still being billed for a service I do not even use!