Billing is useless

I had a fibre line with Webafrica for my parents. They moved to a retirement village and in April 2024 I selected a “move my service” request. In this I opted for the new service to be LTE as they are not allowed to do fibre in the village. After a few weeks I saw that I had 2 x pending LTE services and the fibre still just shows active. I got onto the whatsapp chat platform and asked about it. The agent confirmed that they can see 2 x pending LTE services. They cancelled them and loaded 1 x new LTE service. I then asked about the fibre still showing active, where I was told there wasn’t any cancellation request. I then asked them to please make sure it is cancelled. This was already the 22nd of May 2024. There was even a credit loaded onto my account for the amount of the fibre, because it was too late in the month to get it cancelled for the 31st. So essentially they paid me back for June’s fibre service. Today on the 2nd of July 2024 I got a notification from my bank for the amount of LTE plus the fibre service. Sure as can be, I saw the fibre service is STILL showing as active. I got onto the whatsapp chat again, asking about it. I have now just been told that they never received a cancellation request for the fibre service, only the second LTE service, and I have to request another cancellation again. I sent screenshots of conversations of everything from previous agents but the agent today just keeps saying I’m wrong. I am expected to pay again for a second month for a service I don’t have or use.