Pradeep, Evelyn has posted the phone numbers for registration just a topic or two back. She also mentioned not contact the local centers as they could still be unaware, but contact central Prometric. You could have to phone abroad, but I think it's well worth it. I had the same problem.
Actually I tried calling Prometric center in Australia today morning. Even though I was able to connect but was not able to talk to any representative since all of them were bus y. The line was still on and when the phone bill crossed Rs 200. I decided to put the phone down.