Contract re-instated without my permission

In Feb 2020 i renewed my cell contract Then Covid came in March 2020 and i asked if i could go to pre paid as my business closed. This was done for me in April 2020 In September 2021 Vodacom decided to re-instate my contract without my approval I have tried for 2 months to rectify this but nothing has been done all empty promises I have spoken to at least 20 customer care consultants over 2 months and not one has helped me I get billed each month but dont use my minutes or data What will it take and my issueto rectify this bad service