Vodacom cancellation

Vodacoms service sucks!! Trying to get a contract cancelled without any luck. I phoned in December 2020 to have my 10gig data cancelled. After which they have told me it will be done. Guesse what...??? They have not. I have paid for December and paid again for January. I have called again beginning of February and again the same story they will cancel it and escalate it. Guesse what....??? Still it has not been cancelled. I have phoned once again today to have it cancelled. Again they had the same story it will be cancelled and be escaleted. Now I want to know how many time do one need to phone the cancellation department before you actually cancel a contract??? Please advise and just cancel my 10gig data for once!!!!!!! I will take this matter further.