Canceling cell phone contract after it has ended

My cell phone contract has come to an end in March 2026, and they don't want to cancel the contract and they keep on deducting, I have called *** several times and sent email to their customer care without response, vodacom employees working on canceling and retention department they have unfairly treated me, they don't action their clients request, an knowing very well if they don't cancel the contract, they will keep on deducting without rendering any service that's how they trap their customers to be forced to upgrade contract under duress.