This is indeed a hoax, Glody. It is highly unlikely that you would be informed of such a “reward” via an in-game message, if it were real. Also, in the event that Blizzard representatives were to contact you in-game you would see the blue “Blizz” logo before their name. You can see an example of what I mean here: (http://us.blizzard.com/support/image.html?locale=en_US&id=81).
