Recovery of money given to a Facebook friend

Given money to a facebook friend who needed money to go abroad through a company. Given proof that he belongs to a poor family, who is a CA and premised to return after few months of work. Initially given around a lakh. Then, he asked money for Indian rupees as he was not having sufficient Indian rupees for transfer into a savings account in Icici bank in bokaro steel city. Money had been given in his account but failed to transfer due to some problems in the bank. It goes on similar fashion and total amount comes more than 7 lakh rupees till now. Now my question is 1. How can we get the money back? 2. How to proceed? 3. Who can help us?4. How much will it cost?