Hi Sivaram,
I guess you have to contact the Prometric for this, cause when I did the exam, there was a problem in my mail account and I thought they sent it to the wrong address, but when I contacted them they sent me another set of the welcome kit.
So try to contact the prometric, and surely they will help you, I guess it is there responsibility too, BTW get a photocopy of it when you get the new one.