Struggling to cancel Vodacom data contract

I have been struggling ro cancel my data contract with vodacom with number ***. In July 2023 when I called to cancel, the consultant assisting me said she will just downgrade the package and I can only call to cancel at the End of August 2023 when the contract ends. I even asked will i not call emd of aug and be told another story and she said not at all. To my suprise when I called early Sep 2023 to do the cancellation, I was told my contract was upgraded for another 36 months. I have been calling vodacom contact centre and they keep saying they will listen to that 'call' of when the so-called upgrade was done, I wait for long on the call and keep being told manager is looking into it but I never get feedback. I am not sure how else to get this resolved because this upgrade was done without my knowledge. I did inform the consultant my reason to upgrade as I do not need that data contract anymore which I opened in 2020. Can I please be assisted to cancel this contract, I really feel powerless against this big organisation and worse each time I call, I am dealing with a different consultant from the Cancellation department.

Regards, Livhu