Unfair treatment and unhappy customer

Please help to cancel my fibre contact with Vodacom, You have upgraded my speed without my consent last year I think September or October. I was on 10 speed then Vodacom decided to take me to 100. When I called I was told that Vuma doesn’t have 10 anymore they start at 50 speed. I told them I was fine and I immediately asked them to do the migration for me to new address them I was told that system has a problem on their site then the lady asked to call me back, then I then decided to call in and ask for cancellation a few days after. I was promised that I will get email confirming the cancellation after 48 hours, still today. Nothing. I then called back last month around this time to ask if the cancellation has been loaded then the gentleman told me that he will need to listen to recordings before they cancel and they will get back to me. Stilll now no one came back to me. I called in a several times to ask to cancel the contact with Vodacom. Still today I’m waiting for confirmation to show that it has been cancelled. When I first called in for cancellation the lady told me that my last billing will be on the 20 of April 2024, which I was fine with that. Today I called and spoke to Kervin he tells me that I asked for upgrade in Feb, when I ask him to confirm if the cancellation has been loaded he couldn’t see anything about cancellation.

So I need my contract to be cancelled immediately, so that I will not be billed on the 20 June.