Telkom ITC Listed

I stopped our Telkom lines in 2019 - they continued billing and after I received a mail confirming the accounts will be cleared and closed I am still today being harassed by collectors including being listed on ITC. I have forwarded the mails to the collectors NuDebt Management (Pty) Ltd in 2019 already and to date nothing has been done and I remain listed! On the 18th of May this year after I mailed again Blake Collections advised the matter has been referred to Telkom. Till today no feedback and I am still listed on ITC! I want my name cleared and Telkom and all collectors to focus and people owing money!