Firstly I'd like to welcome you to the forums and say that I'm truly sorry to hear that your phone line hasn't been working for a while, and I'd love to help you out.
I've done some testing on the line and can see no reason why your line should not be working at the moment. I'd like to thank you for letting me know about the testing that you've already done. I think it best that we arrange for someone to call out and take a closer look at things for you.
I've sent you a private message in order to get things moving with this, please look to the top right of this page where you'll see a blue envelope icon, click on that and you'll see my message.