Sick of Vodacom service.

My contract was up on 22 Nov. I called in June to cancel or change number to prepaid and they said call on 1 Oct. I called 1 Oct and was told my last bill will be end Nov. I called again early Dec to confirm as it showed on my bill that I am still being charged and I was told that it was cancelled and a credit is being requested. I called again on the 7 th Dec only to be told I cancelled in Dec and had to pay for Dec and then got the phone put down on me. I drove to Vodaworld only to be told they put in a request to the recording. 9th Dec. Call closed. No resolution. I called on the 10th. Lady could jot help me. Supervisor will call and nothing has happened.