0345 454 1111 is customer services.
Welcome to the community and I'm sorry to learn you've been without a telephone line since install.
I have tested your line and haven't found any faults but since you have already checked your equipment I would like to arrange for a technician to take a look at this for you.
I'm just going to send you another message with appointment times which you will find if you click on the purple envelope at the top right of the screen.
Speak to you soon
New around here? To find out more about the Community check out our Getting Started guide