Telkom: Credit Bureau Listing/Cancellation of Fibre 2018!

I cancelled my fibre account with Telkom by giving one months notice on 17 October 2018!!! Telkom is harassing me non-stop since then threatening me with legal action and bad credit bureau listings due to unpaid invoices. I do not have a Telkom Fibre account any longer. Although I have explained the situation telephonically, in writing on email and I even went to Menlyn and Rosebank Branches for assistance, they are still sending me emails harassing me!!! I am at wits end and extremely shocked about the terrible service received from Telkom. Not even their branch managers can sort out the situation! Only thing left to do is to contact Carte Blanche to take over this matter as I can see on the Google Reviews so many people are complaining about the same thing!!!!