1. You have taken loan from the Bank for paying to the developer.
2. The developer has cheated you for agreeing to sell you the flat which can not be constructed by him and took money from the bank for and on your behalf as agreed/directed by you.
3. Your advantage is that there is no property of yours mortgaged with the bank and the property which was proposed/agreed to be mortgaged can not be constructed.
4. So, the Bank can not enforce security interest on any property mortgaged with it for selling it and recovering the dues as per SARFAESI Act,2002.
5. The Bank officials who sanctioned the loan for the said property will be in trouble internally for not verifying the fact that land has been acquired by Metro Rly. They may pass on the buck on their empanelled lawyer who had made the search of the property. However, you can not sue the Bank for it since primarily it is your responsibility to conduct property search and pay back the lending Bank the loan you have taken from the Bank.
6. The Bank can not attach your salary for non payment of EMI unless you have given a mandate to them for asking your employer to deduct the EMI from your salary and remit to the Bank.
7. Lodge police complaint and file complaint case before the Consumer Forum as advised in my earlier post since those are the right course of legal action for you.