Bad Service - Contract continue after 24 months with approval

I have a Vodacom contract for 24 months that ended in May 2024. Since May 2024 to now, I have been asking Vodacom to cancel this contact with no success. The contract was suppose to end in May 2024 but Vodacom extended my contract without my concent or approval. They cant provide proof that i ask for an contract extention. I have called Vodacom call centre at number 135 and have been sent from one agent to another without assistance. The last agent advised that a need to pay R39 to process the cancellation which i did but the account is ongoing. Who extended my Contract? How can I cancel Vodacom Contract? My contract I***-8 can not be cancelled after 24 months. Please help