Vodacom cancellations

Vodacom cancellations provides extremely poor service, in fact it does not exists. I have tried to cancel a cell number ***) for three months that I have never used, neither have a sim card for. I have called two numbers that Vodacom provides e.g. 082 135 or *** with options to cancel. A message is then forwarded to your own cell that your request is received but not confirmed. I have been to a Vodacom outlet whereby they phoned and got hold of a telephone operator that promised to help indicating the system is off line. This now three months and the line is not cancelled.