billing AND feedback/response, equally useless

I needed to cancel my debit order as I do not use the bank account it was deducted from anymore, I phoned Telkom and all my other debit order service providers on the same day. The call center agent assured me it had been cancelled and I paid cash(early I might add) a few days later they tried to debit the disused bank account and the debit order failed but I thought nothing of it as I had already paid cash...Until I got my next bill and there was an additional R180 charge for a failed debit order.I immediately called to clear it up. I was told by the agent that she could not help me as I was misinformed by the original call center agent and the debit had to go off and could not be cancelled immediately (CellC Got it right?) she said I need to speak to her supervisor but she was busy and would call me, this was around the 7th of August I have had no call. I then emailed their escalations department three times with NO response and messaged the telkom Twitter the 18th and was promised a call multiple times which never transpired, I paid my regular bill amount a few days late as I honestly believed I would get a call as promised, now, after paying, my service was suspended!