******* debt collection by TELKOM and NuDebt

I cancelled my Telkom account several years ago and returned the faulty device. TELKOM continued to bill me despite several visits to their offices in Rosebank, Benmore and Morningside as well as phone calls to their “customer service “. They continued withdrawing money from my bank account via debit order despite the fact that I did not have any service from them. I eventually cancelled the debit order with the bank. And Telkom continued sending accounts for a non existent service. They then handed me over to NuDebt debt collectors—-they send threatening emails but NEVER respond to and emails sent to them. They are now threatening me with black listing. This is in direct contradiction to the laws as set out by the National Credit Regulatory Board. Please advise