Vodacom contract

I had a cellphone contract with Vodacom 2021 for a period of 3 years and it ended in march 2024. I have been trying to cancel it but with no luck nobody want to help me. They suspended my line December and I paid the amount they wanted to unblock my number and I tried calling them January to cancel the subscription and they tell me I renewed my contract which I didn’t and they said it end in march. January 2026 they debited R700 and something from my account which I wasn’t even paying during my contract really don’t know what to do anymore. Please help me to close this contract cause I really can’t afford it