Failing business

I have ordered an FLTE connection advised by one of their agents, when it got delivered i activated and it worked, days later i kept getting disconnected and upon logging the query i found out that the FLTE will not work, we spoke about Air Fibre which will be the best option for my area. I asked about migrating from one package to another which i have proof of conversations and even on their recordings they will find such(they don’t even want to provide me with recordings). Terms and conditions also stipulate the migration process which does not have a cancellation fee, I’ve followed due processes that they kept giving me and now i have amounts i owe for the FLTE connection they collected from me, which i payed for collection, i even had to confirm that its collected they way they so disorganised. I am sitting in a position where whether its through whatsapp or calls, they keep cutting my calls and chats to avoid accountability. Secondly the ****** fibre went of because the installer brought in a used Rn which was noted, it died and couldn’t get network, i have been in contact with the installer and he has been coming to my house 4 days in a row without luck, hes blaming them, they blaming him and I’m sitting here suffering with internet i payed for. 5 days now without Internet connection and all they do is cut chats and cut calls not fixing queries, i asked for updates and records of progress in my billing matter and their incompetence comes forth as i have to explain one thing every time to a new agent