I believe you can have that done for £25 as a non fault callout charge, I don't know if they wiĺl go on the roof, it's possible the cables can just be pulled off if they are not firmly attached.
You can either call Virgin on 150 from a Virgin phone, mobile or landline, or 0345 454 1111 from any other phone to arrange this or wait for a forum team member to pick this up which maybe a couple of days.