Line tests are picking up a Loop fault, This could be caused by internal wiring, in order to rule this out we need you to connect your phone direct to the Test Socket (behind the faceplate) and test again.
If there are still no incoming calls we can pass this to Openreach.
That means the faceplate is at fault. This is classed as internal wiring and if we sent an engineer you would be charged for the engineer visit (£65) however you can purchase replacement the faceplates from any hardware store and fit it yourself for a fraction of the cost
Do you have any other sockets is the house that are hardwired to the master socket ?, With the faceplate removed they wont work but If there are no others you can stay connected to the test socket.
Hope that helps
Well then that could be the problem. If you have no extension sockets then there is no need to connect those wires. They are presumably a remnant from old extension wiring which will be causing interference. Just disconnect them and loop them carefully out of the way, see what happens.