Renewed contract without customers approval

I had a contract with vodacom from Feb 2019 and it is due to expire 8 February 2021. I called a message informing that and a consultant called and I gladly told the consultant that I wont be renewing my contract. However I would like to get a data gig contract only. She then informed me that I need to give vodacom a 30 days notice to cancel my cellphone contract as I would not be renewing it and I need to give a call on the 8/01/2021. I called vodacom and I was told that my contract was renewed without my approval and they dont know how to fix it. I dont want your contract for another 24 months. Stop being *********** and forcefully debiting from my account an amount I never agreed to