Hi Kaz123
Welcome to the Community, I'm sorry for the problems you've been experiencing with your telephone service at the moment.
I've located your account to take a closer look at this and run some tests on the line. I'd like to arrange for an engineer to come and take a closer look at this, if you're available?
I've sent you information regarding this in a private message, which you can view by clicking the envelope on the top right of this page.
Talk soon
Craig