Mweb won't let me cancel my fibre and want to charge me over R3,000 to cancel when they didn't need to install (only activate the router)

I’m moving house where there is already fibre and I requested my Mweb fibre to be cancelled on 1 Aug. I still have no response from Mweb - I need confirmation that the service will be ended by 1 Sept. I started the service on 16 June this year and requested cancellation on 1 Aug 2020. Fibre was already installed at my place, the technicians only had to setup the router. I have received no call from Mweb and when I have called them they said the cancellation would cost over R3,000 but my place already had fibre into my lounge, the team only had to activate the router (so I should only pay the pro-rata portion of the ~R500 activation fee, not an installation fee too). I am also still waiting for the cancellation quote. Very unhappy.Please respond, Alexandre Rodrigues ***, account ***4, cell ***