Bandhan Bank — Fake job offer

I applied for bandhan bank back office job and then someone identifying as HR kolkata called and said I have been selected and instantly they charged 250 as processing fee. Then 1 day after they called and demanded 1600 as some security fee then after few days again 9360 then 31000 only then I realized they are none but scammers and I became their prey and I lost 42000. They used to send documents and none and believe these are fake as signatures there are with blue pen and stamps are also there.
I made GD in nearby cybercell policestation but unfortunately I found complaining to police is just for namesake and they are very relaxed and don't want to catch culprits until and unless you have connections with top craded officers such as IAS or IPS or any politician. Their phone numbers are on till now and its very easy for them if they show some interest but its sad I did not find any help from them