Vodacom - Cancellation not activated

The worst customer support ever. I've tried to cancel my data package (which is 27 months old), but couldn't do it on the internet or via e-mail. I had to phone them, so I phoned them from a Vodacom shop on 22 January 2021 to cancel it on 28 Feb 2021 (which is more than a month's notice). The Debit order went off again at the end of February 2021 and nothing was canceled. I had to phone again and request the cancellation again. They didn't want to refund me and just tried to convince me to upgrade instead. After a long struggle, they canceled the contract for the end of March 2021. I'm quite upset, as I had to pay twice for my internet for March 2021. I won't take out a contract from them again.