Uncancelled contract

I had a contract with vodacom since 2014,everything was well until last year when I had decided not to renew my contract, they kept issuing me me with new gadgets, I already declined twice,when you try to explain to them why you can't continue with their service, they seem not to listen to the customer. On January this year I called again, I was told that if I cancel my number won't work again, I told the agent that it will be unfair as the number belongs to me,he then said I will receive the message for cancelation, but I will have to pay until February 2022,I said that won't happen as I was canceling since last year. Now when I call to do follow-up my number get rejected when it reaches the consultants. I'm so disappointed by what vodacom is doing more especially during this pandemic where most of us are financially strained.