Cancelled services still being billed

Why is trying to get rid of Telkom so difficult? Beginning of September I gave 30 days notice for cancellation of my ADSL and land line. I unplugged my landline as I was not using it and only had it in order to have ADSL Wifi. Moving to Fibre in October I no longer needed ADSL or the landline.

Firstly, it was a mission to get a reference number for cancellation. My first cancellation was telephonic, I got no reference number (supposed to be sms'd or emailed). Then I managed to do the online cancellation and got reference number ********** 4. The current online status indicates "Closed Telkom Cancelled" created 12 October 2018 but it appears that my account is still being billed. I disputed the account online and got reference number ********** 4 but then also received an sms stating that my account is suspended and handed over for collection.

I should not have an account to suspend or an amount to handover for collection. Can Telkom urgently correct this account and ensure that my credit record is not impacted by their bad administration and accounting issues.