Because of this problem, I was taught to always select a one as the last digit, prior to switching my transponder code.
Oh well, this demonstrated that some people actually pay attention to the transponder codes which are displayed on the radar screens.
This ATC should be given a cash award for a job well done.
I doubt that pilot is going to have a job with Virgin (VS) anymore… Just the cost of rerouting will be expensive itself…. And add to that the US apparently refused VS entry into US airspace… Pretty serious stuff even if it was accidental…