Cancelation of Contract

I am extremely disappointed with the service and call center. I have been trying to get ahold of an agent to report my matter and seek clarity, to no avail. Yesterday I drove to the Vodacom shop and I was given a number to call nobody is answering. My contract came to an end in on the 30 April 2022 and I notified Vodacom in March that I am canceling and they moved me to Prepaid. So why is my money being debited in May? Apparently I am not the only one who experiences this. You see why people are opting for month to month. It's because of bad service!