Telkom Incorrect Billing!

Telkom is like a paper business basically, when I walked in store recently to query an invoice from last year I was told to call the call centre which never answers any calls, Thanks to telkom my name on the credit bureau still reflects that I am owing telkom money for an account that I settled and has been closed long ago,

I have been trying to call their call centre and telkom has completely removed the option to speak to an agent, How exactly do they expect to conduct customer service? When i went into the The Rosebank branch I was told to call the customer so neither the branch or customer care line wants to assist me