Cancellation of contract instead of an upgrade that was not approved.

I had a Cell C contract and my phone was ****** on the 12 September 2022. I went to pay it off and cancel that contract as it was paid off. I then requested a new contract and I got it. I was later informed that instead of cancelling the contract I paid off and starting with a new contract, they just upgraded my previous contract which was paid off. I realised because I did not understand why the data from the old contract was now with my new contract. All I requested was a Sim swap as I still wanted my number. I have been calling and have been receiving reference numbers but nothing has come of it. Now I had a debit order go through for the old contact which I later reversed because I paid off and cancelled that contract on the 12, why am I still being debited. Now they’re telling me to go to the police station and make and affidavit stating that I had requested for that contract to be closed or cancelled. I am not happy because why is it that they’re not fixing their mistake, but instead requesting me to go up and down to fix their mistake. My new contract is from the 12 September 2022, it is not an upgrade and I’m not happy with the lack of service from Cell C, instead they’re telling me the matter was resolved, but it was not as I would not have had a debit order go off my account from the previous contract. I currently have 3 contacts and a data only plan one is coming to an end by end of September. I want Cell C to fix this so that I can pay the data contract that is ending and not the contract I cancelled. This are my details. Phindile Makgatho ID no: *** Cell C number ***