Telkom - customer service big joke

Absolutely frustrated with Telkom customer service, their call centre and social media department. They owe me R1100 rand and I'm not letting it to. I emailed a service cancellation form to Telkom in June last year to cancel a 30 day rolling data contract and recieved confirmation a few days later. The contract was never cancelled as requested. I have a list of email addresses of customer service agents and supervisors that I sent copy after copy of my cancellation form to over a 4 month peroid. Eventually after contacting Hellopeter I had a response from the media department and they requested that I fill in a new cancellation form, which I did and attached my original form. They cancelled the contract as from the day they received the form and not the original cancellation date. I moved to an area where there is no LTE data reception. The 10 July was the last I logged into the network. Telkom has no dispute resolution centre and when you phone the call centre they refuse to put you through to a supervisor. So where do you go Telkom !!!! to resolve issues. A dysfunctional organization where a sales department suffers because of a useless call centre and accounts department. Please help.