Vodacom-Worst Customer service ever.

I am trying to cancel and upgrade since 18 Nov 2020. I am charged every month for an upgrade and handset that I am not using. My reason for cancelling is the fact that the telesales person **** about the GB size of the handset that I would receive. Every time I phone them they tell me that there is no cancellation lodged and they will get the people who did the upgrade to contact me since it is outsourced. I have been phoning them every week and still nothing happens.