[Jonnymeg]

It sounds like the job was put through as complete (even though it wasn't) and a repull booked to fix the main drop cable. As the job has gone through on the system as complete the number port would have gone through too.

Virgin now have the facility to do emergency repulls which means they could put the cable in the same day if they wanted too. Do you have a contact number for the engineer who came?

if you do you could try contacting him and say you are going to make a complaint and ask to speak to his manager who may be able to do it.
Failing that i would call up virgin and tell them your services aren't working and to send a tech out to see if they can put a tep. fix in place. Once the tech is out he may be able to get you and emergency repull.