Sorry that your homephone is't working, good to see you've tried some troubleshooting already!
I would suggest firstly that you try some extra troubleshooting in the landline.
Remove the power cable from the back of your modem for 60 seconds, then plug it back in. After approximately 2 minutes the lights on the modem should settle into a stable pattern
At times the wiring may be what is causing your issues. Plug your phone directly into your modem's telephone ports to eliminate your internal wiring
If the above doesn’t fix the problem, then I’d really recommend getting in touch with our team on Messenger so we can log a fault.
Please note, our Messaging team are currently experiencing delays so it's best to complete some basic troubleshooting before getting in touch with them
Ask to speak to a human, then leave your full name and the information about the issue in the messenger window
Hope this helps