Telkom - Shocking Account Service & Cancellation

I have an ongoing issue with Telkom. I cancelled my Telkom account originally in November 2021. The line has not been used in this time. I have cancelled it twice since then, receiving a reference number each time. I have now received an account for R3527 for charges up until end of February 2023. Why is no one able to rectifiy this, when the problem is on Telkoms side and I followed the correct channels. I just keep being referred from person to person, is anyone else sitting with the same kind of issue.