In India, people in north India generally use Kumar as a middle name so his name could be Amit Kumar Bhardwaj which may be used as Amit Kumar or Amit Bhardwaj.

As regards to the amounts of money that they have collected, my guesstimate would be not less than 500 crore rupees till date. If you see the transactions in the wallet ID given in this thread, it shows BTC being transferred to a lot of accounts on a bi-monthly basis i.e. on 6th and 21st of every month. This gives a hint as to the amounts being siphoned off by them.

Hope some authorities take notice soon and takes action against Gainbitcoin and various other similar companies who are running amok with people's money.