Refusal to cancel a contract that ended in 2021 by Vodacom

I took a data with Vodacom was for 24 months. From 2019 to 2021. After 24 months, I called Vodacom to cancel the contract but they never did. Every time they called me, I requested them to cancel the contract because I did not even have the router anymore but no one ever helped me. I feel this is a *****ulent act to ****** money from me and destroy my credit profile. . I have tried all avenues to fix this contract issue with Vodacom but no one is available to assist me.