I've watched the video and I think it's great
that letter disputing the call costs and the phone numbers listed is enough. they're on his bill so Virgin shouldn't be charging Adam or anyone for the numbers, when they say themselves they have been fraudulently made from their compromised equipment.
it's a bit like the police selling your stolen property and saying they never recovered it, whilst they're counting the proceeds out infront of you.
sorry mate, if it turns up we'll let you know