Telkom billing issue.

I had a Telkom account for fibre. I have emailed Telkom on the 8th of May 2024 and gave them 30 days notice to cancel my service. Now I am getting thread emails from Telkom and Telkom have blacklist me for an outstanding account. For the last twee weeks Every day I phone and email them but this issue is just not getting resolved. Telkom customer service keep on telling me they will resolve this issue but every day I phone Telkom and it is not resolved. Telkom doesn’t want to resolve this issue and take my name from ********* list.