Telkom Debiting Me For No Reason Even Though I Cancelled

I have taken a contract with Telkom on the 7th of February and cancelled two days later, but my account still seems to be active on there system even though I sent all the relevant documentation for a cancellation and this I've sent multiple times . Its now August and I still get debited on a monthly bases, which now forces me to do a debit reversal every month. I have contacted Telkom a number of times but there agents always give me a new story as well as a new case number once an agent actually told me that my account is closed and the number that was supposed to be given to me is now given to someone else.

If someone could please advise me on what I should do next as I'm totally out of options