Indigo Airlines — Fraud Job offer

I got fake offer of Ground staff job under name of Indigo airlines through shine.com. They demanded 2500 as registration fees, they send me some offer letter, test link which I'm attaching with this mail. After these letters which is signed by Shivam Malhotra that's why I thought it was genuine. But after paying registration fees they demanded 8000 more. Then I find suspicious and because I don't have enough money I requested them to refund fees. But they are not refunding it. I'm mentioning their contact numbers below:

Raj Shekhar:- [protected]
(who's contact number is mentioned in message I got through shine.com)

Other Verification officer:- [protected]
( With whom my conversation done and demanded all these amounts.)

They told me to transfer money to Mr.Surya Prakash's Account.

I find here that as there is similar case of hrgadhavi too.

Please take it seriously because like me other innocent people are becoming victim of these same people.