Bad installation and installers

I waited 7 months for installation, at last they came to install on Wednesday 18 March 2020. Received the wifi modem today and after battling from 09:00 this morning, I find out that the fibre line is actually dead. So why did the people that came to install not inform me about this. Only told me I must wait for three lights to come on then left. Is it not their responsibility to check that the line is active and working before leaving. And also now I am sitting with a router that I can't use because of an inactive line and who is going to be paying for that router. Now I am being told that a technician has to come out to come check the line. So are we going to be waiting another 7 months for this to happen. This really is ridiculous.