How can I lodge a complain and get back money from a fraud agency.

Sometime back I was in urgent need of loan to meet some expenditure. i came to an advertisement published in a local Bengali leading newspaper of a cooperative credit bank which offers loan to such persons at a low interest. The fraud bank stated that all their operations are in digital mode. I was lured to contact them over phone. First, they asked me to be member of the cooperative by buying some shares. Then they told me deposit the required money as GST imposed on the loan by the government. Then they told me that government has announced HAS SOME 30% subsidy to the loan seekers of the entire loan amount, which need not be returned to the cooperative, but out of the 30% subsidy, 10% will have to paid back to the co operative as towards infrastructural cost before the release of the loan amount in advance. Suddenly after 3or 4 days, they told me to again deposit some money again as incentives for the staffs because they have worked hard for getting my loan sanctioned. After depositing the incentive money, they will visit my home to get all the documentation done and immediately the loan amount will be credited to my account. But they never came and they had probably barred my number, and I am unable to contact them. later on I carefully looked into the paper they have sent me, does not have any registration number mentioned.I then inquired about the cooperative bank and found that the address given in their letter is fake. Fortunately, I have made all the monetary transactions on line through NEFT have taken screen shots all the transactions. I have made the transactions in the name of a lady, who posed to be the Director, of the cooperative bank. The account is in a branch of a nationalized bank which is in a village area, far away from the fake address from the cooperative bank. Now, How I can book the fake cooperative bank into the court of law and get back my money.