Hey @ExeterBertie,
Welcome back to the community and thanks for taking the time to post.
I'm sorry to hear of the issues that you're having with your landline, I have looked into this further for you as I was able to locate you on the system.
This will need a technician visit to resolve, I can arrange the appointment from here but would need to confirm a few details via a private message, that I will drop over in a moment.
Please look out for the private message and we can get started.
Regards,
Steven_L