Canceled a Fixed Line which is not yet canceled and issue was not resolved

A bit disappointed since Telkom service in a fixed Line that was canceled a few months ago, is still showing as active on Telkom end and they are debitting my account every month,

I have submitted the requested documents and even cancelation of third party ISP Smerno who confirms Telkom line was handed over in December,

Telkom support is now stating the line is still active when it was removed by Telkom a few months back and cancelation information I do have as proof,

They insist that the line is still active with another ISP which I am not aware of as I have only dealt with Smerno!

When trying to contact their retentions department they are not further assisting in resolving issue and Telkom is now owing me an outstanding balance due to deductions conducted on their end without an active line or contract.

Very disappointed with the Customer Service!