Welcome to the Community, I'm so sorry for the problems you're experiencing with your telephone service a the moment.
I've located your account to run some tests on the line and we're seeing some sections of the line as non contactable. With that in mind, if you're still experiencing issues with your line and you've managed to test your handset by trying an alternate handset or yours on an alternate line, I'd like to arrange for an engineer to come and take a closer look.
To get that arranged, just respond to the private message I've sent. You can view that by clicking the envelope on the top right of this page.
Apologies again for the inconvenience this issue is causing, we're looking forward to hearing from you.