Impossible to cancel conctracts

I cannot seem to cancel my Vodacom contracts. I have lost my job due to the Covid crisis. I have tried to cancel my two data only contracts since November 2020. They cancelled only one. I cannot get the other cancelled. I have also requested by main number to be switched to pre-paid. I have spoken to several people, including the so called supervisor. They all promise that it will be done, and that I will receive email confirmation within 24 hour, but nothing happens. I cannot speak to the same consultant again. They are never available to take my call. I get promised that they will return my call, but not a single time did the consultant return my call. This includes the supervisor. I sent emails to customer care. Two agents phoned me and told me that they escalated it to their team leader and that I will receive feedback in 5 to 7 working days. Nothing! I sent another email that has not been answered. I am at my Witt's end.

Vodacom should advise their customers that once they sign up, it is for the rest of their lives, as you can never cancel it again. Is this really how they want to treat long standing customers.