Hi there @Ratan
Welcome to our Community and thanks so much for your first post - I was sorry to understand that you're having some issues with your landline via your Hub.
I have located your account from your forum information and have done a few checks on your line from here; from what I can see, the line is not fully enabled. It won't allow me to manually do this so I have escalated this to our internal back office team to take a closer look. The usual timescale for this is 24 hours.
You are also impacted by a known area issue that can cause intermittent broadband issues; as you get your landline via your broadband hub, you could get some interruption with the line but as you are having no service since installation, it's best that we take a look at the line directly.
Please do feel free to pop back here for updates and myself or a colleague can check for updates for you.
Cheers