Cancelled but still getting billed!!!

I cancelled two services from Telkom. 1) My LTE service which was sold to me as a up 90MBPs service. Initially when I signed up I got 80MBps eventually in September 2018 it was a max of between 1 and 3MPBs around 01:00 but then dropped this dropped even more during the day. As I work from home and "dial" in to my clients I was using my Cell Data which cost me roughly 1-2 time more that the Telkom Contract Data. I complained regularly with no success!!!! In December 2018 I cancelled my LTE line via telephone as all other means did not wor**** They said they could not give me a reference number as the system was down. A week later I phoned again this time I was told the cancellation was in Progress. By the end of January the LTE line was disconnected. Telkom is still collecting my monthly fee!!! 2) With my telephone line I have the same experience. Number has been ported to Axxess in other words it CANNOT work and yet I still get billed. Fortunately I have a reference number!!!

I have decided to stop paying my Telkom Phone account but I'm struggling to get the debit order released!!!