Angry client

I the middle of January 2019 I contacted Vodacom for an upgrade which was successful and my phone was delivered. The following week after receiving my phone ,I contacted vodacom helpline to ask to cancel my 3g month to month which I have been using and I as told its canceled and just before month end January I called again just to make it has been canceled and it was confirmed, come 1 February it was given to me even though I did call to cancel and every week I called Vodacom to remove this and till today no one has called me for any follow up, and it was billed on the bill generated on the 6 February and called and asked for someone to call me until today no one has called or even do the follow up, the service and treatment I'm receiving from Vodacom is not up to stand and as their client I'm not happy as I feel they take me for granted.