Problem with cancelation of Vodacom contract

I have a data contract with Vodacom which i want to cancel.. When I entered in this contract, I was told I can cancel it at anytime if I don't want it anymore as long as i give a month's notice. Now when I call vodacom for cancelation only the answering machine gives me option to choose and it says I'm only eligible for upgrade in August 2025 and for cancelation in January 2026. I'm not even given the option to speak to a vodacom consultant. Now that I want to cancel it , no consultant is available to help me with cancellatio I called customer care , the consultant still to that number that doesn't give me option to speak to speak to a consultant. I'm surprised because when I was first offered this contract , I was told I can cancel at anytime as long as i give a month's notice, now I'm told by recorded answering machine that I can't cancel it until 2026 January.