The sensible option would be to block TeamViewer from IP's that are known to be used by scammers, it's not as if I and I suspect others have reported these IP's to BT, Talk Talk and Sky yet nothing ever happens. And while we're at it block the telephone numbers these people use, some of which have been active for over 3 years.
Of course that would be sensible and easy so not likely to happen.
Biting the hand that feeds IT
