Telkom fibre terrible service

I had Telkom fibre installed over two years ago but luckily kept my adsl service. Since then it works for a week or two then goes down. When I go through the hassle of reporting a fault I am told the call out will cost over R1000 if the fault is on my side but it never is. Since they insisted they had to route our landline through the fibre connection we not only had to change our number but it hardly ever works. The ADSL has been a life saver but relies on a single Telkom line which is under threat from the neighbor's trees. I am sick of the lack of transparency and having to pay for a service that hardly ever works!