Telkom Billing Dept Despicable Service

Telkom's Billing department is so unhelpful and the customer care sucks. I have phoned them in and enquired about my account following a cancellation of the Admin-plus device insurance. They kept on sending me an invoice though I had cancelled the insurance three months earlier. The call center agent "Mthiyane" was so rude, and I requested the issue to be escalated to his supervisor. The agent gave me their email address for the issue to be resolved. It's been a month now and there has not been any feedback though I have been sending them emails to enquire.