Thanks for your post and I apologise for the various issues you're having with your Telephone connection.
Upon looking at things from over here, I can see that is says a fault on the line. This will require an engineer visit to fix.
I have booked you in with the next available appointment. Please find the appointment time slot via your online account. This can be cancelled and rearranged from there if needed.
Let me know if there's anything else I can help with.