Vodacom cancellation department

I tried canceling my vodacom contract since 16 May 2020, they keep on saying they have canceled it but they are just lying. I called again in June, the ly said the same story, "they have canceled it". Which is a lie. Today I called 5times, every person is not helping but insisting on convincing me to renew the contract. I even went to the store, the store consultant said the contract is still not canceled. And they are not dealing with cancellation. The consultant even called the vodacom cancelation department. They told him the same story that they generated cancellation. Now who exactly should cancel this contract???