Telkom cancellation service

I am trying to cancel my Telkom account from 26 Jul 2018. I have receive a reference number for my cancellation, I have lock disputes but with no action. This morning I try online chat it keep saying hold on for the available agent for almost a hour. We have phone them several times with no luck, every time it is a different story. What must we do to get our account to be cancelled? I have even stop the debit order, they keep sending invoices.