Telkom Accounts dept/systems pathetic and useless

I Cancelled my account with Telkom more than a year ago and installed Fibre. They failed to update my account and since then has been harassing me with invoice after invoice accumulating and every time I escalate, they will look into it. Now after a year I am handed over to VVM phoning me to pay as Telkom handed me over. Telkom, sort your systems out before handing people over. This is not the first experience with you. Pathetic how unhelpful your staff are. Who do I speak with on your side to get this sorted once and for all!!!????