Still being billed after cancellation more than 6 months ago

I have cancelled my Telkom contract last year July 2017. In November I saw that the debit orders are still going off, I phoned in, they told me that they did not receive th cancellation, I must resend to them, which I did. Telkom has kept on bililng me up to this day. Every single month I have to reverse debit orders, call again, and be told that it will be sorted now again after again forwarding all cancellation emails. I have spoken to MANY consultants, Jabulani for one who also told me it will be sorted, I must let the debit order go through which is now over R1800 and they will reverse all installments after cancellations. He is now ignoring all my emails. I have not used this internet since 2016. I have complained on facebook and Lebo gave me an email on my post and asked me to again send the cancellation email which I did. Week later still no response, I then went back to the same post, complained again, and then Lebo again gave me an email to send it to. I have now phoned back for what feels like the billionth time, I spoke to Confidence who assured me it will be sorted. I have never in my life had such utterly pathetic service and I urge everyone to NEVER do business with Telkom.