I read that Cryptocurrency trading is ban in India maybe they are having a crackdown or some sort so you should present your arguments with the help of a lawyer.
There is no trading ban in India and all the exchanges are running smoothy despite the occasional fake news coming out about a complete ban. Here is this situation what he has to do is to if the bank authorities are delaying in sorting out his issue with the account he can approach the ombudsman and they will investigate the issue and sort them.
After reading others comments it looks like there will be no solution to this case for years because that much officials are not worried about their customers.Its unfortunate that we are losing our money to these banksters for no reason and this also the reason for the cryptocurrency evolvement.