Sudden Member Number change

I finally got my replacement passport today after the Air New Zealand fiasco where they damaged my old passport.
I dutifully went to go and add passport and API information to an upcoming booking to the US, and for some reason, my booking wasn't linked anymore.
I then realised that the account number didn't look familiar. Everything else looks okay, statement, FC account balance, tier points, just the number has changed, from one 009 number to a different 009 number.
Very odd. Anyone have a clue what might be going on?
Mike
I dutifully went to go and add passport and API information to an upcoming booking to the US, and for some reason, my booking wasn't linked anymore.
I then realised that the account number didn't look familiar. Everything else looks okay, statement, FC account balance, tier points, just the number has changed, from one 009 number to a different 009 number.
Very odd. Anyone have a clue what might be going on?
Mike