Telkom complaint still unresolved

In February 2019 Telkom sent me package containing a 3G handset and the following day disconnected my fixed line. I reported this on HelloPeter several months later as Telkom failed to respond to any of my letters as neither did ICASA or Dept of Public Enterprises. I am now being pestered by a debt collection company over charges being levied by Telkom in respect of the fixed line. The latest of these being Debt In to whom I wrote with full details of the situation on 16 July 2021 and I have a delivery receipt from ***. Is there anyone at Telkom who can put an end to this nonsense ? I have refused to discuss this with Debt In over the telephone.