If you pulled the wire enough to rip it out of the back of the master socket, then you may have snapped a copper core inside the insulation.
Strictly speaking this is an Openreach engineer job to fix and would be charged for.
Is the A and B screw connectors or IDC, and to double check we are not talking about the faceplate that you can easily play with, but the incoming telephone line from the exchange that goes to the back of the master socket.
You have a fttc (fibre service) I presume, in which case using a ADSL filter to connect sounds unusual, usually the master socket has a dedicated socket fitted. Photo's may help to avoid confusion.
The normal install for FTTC, means a socket like http://phil.lavin.me.uk/wp-content/uploads/2012/02/f...
will be in the home. This is very small chance you were on the FTTC microfilter trial though.