Thanks for popping back to our Forums today; sorry that you're having some issues with your landline. Cheers so much for already checking the connections and a different handset; that helps immensely.
I have located your account from your forum information and I can see that at the time of writing, this has been flagged as a known area issue. As yet, it is in the process of being raised so I don't have a estimated fix time currently but I have logged it in your account accordingly for you.
Once we have any updates, your account will be noted and it will be added to our Status Line/Page for you.
You are also welcome to pop back here at anytime and we'll be sure to check for updates for you.
(You can indeed contact us by text to report any faults or if you have any Customer Care queries - just text us on 07533051809)