Telkom's failure to hold their end of the contract agreement!!

@telkom I have struggled to get any feedback with regards to a case that was opened as a result of an account which was closed 3 months after I had made initial request for its closer. I keep being harassed by Nu Debt management even though I have been told several times that the issue shall be addressed and I do not owe any money on this account. Could you kindly please resolve this issue, I followed all the right procedures when closing the account. I gave 30 days notice, paid my last bill post me living the premises where the fibre line was active and yet the account was only closed 3 months later and now I am being harassed over a service not only did I not use but also it appears I am being punished for having followed the right procedure. I have visited the Tableview branch several times to follow up on a case that seems to be ignored with regards to this issue. I think this is extremely poor customer service. I was never behind on my bill so I do not understand why I should be subjected to spamming of emails and texts from Nu Debt.