Are you or are you not intending to move to VM cable, as you strongly implied earlier? I did ask you but you haven't replied.
If you are, then the fault on your line is irrelevant as that line is not used for VM cable, as has been pointed out. There is no need to stay with Plusnet awaiting a fix. Unless an outstanding fault report prevents a migration or number port, which seems unlikely as AAISP specifically advertise being willing to accept lines with faults.