There are no castratis alive today, at least in the Western world. Castrating men to preserve their singing voices is a practice which died out in the 19th Century. There is only one recording of a castrato, Alessandro Moreschi, from the early 20th Century. Unfortunately, Moreschi wasn't a terribly good castrato, just the only one around when the primitive recording equipment came to the Sistine Chapel. More often than not the recording sounds like a dying cat.

If there were living Indian castrati I would be very much surprised (and slightly shocked).