Asked to cancel contract - got upgraded

I just called cancellation department to cancel a number. I explained to the person that we don't use the phone anymore. He kept telling me about new options and all I wanted is to cancel the contract. He said is going to cancel the contract and put me on music and did not come back to me. I cut the call and tried again to cancel the contract and got told that contract is not ready for cancellation until Jan 2021. So he upgraded contract. I want Vodacom to cancel that contract.