Terrible *********** service from Telkom.

I gave notice to cancel my Telkom service on 5th September 2019 and received a reference number. I had no service from 28th September 2019, but they continued to bill me for the line and as of 22nd January 2020 had still not cancelled the account and were still billing me. I was supposed to receive a final invoice and confirmation of cancellation, but still nothing.