Rock thanks for the Joke but actually it's the fact that you stated. It is exactly the way it is happening.

I personally went to Qatar Office and extended the Date on Ticket and when asked should I reconfirm they said no and can reach Airport 2/3 hours before the flight.

If over booking is usual they MUST inform the Passenger that you are already in overbook flight and if it is important reconfirm either one day before or 4/5 hours before, that's it.