Vistara — I am complaining about the job offer notice

I am vilingston. Recently i am searching for the job and i received this mail regarding interview of vistara airlines. So i proceed with further interview process. They asked me to deposit rs.2000 (Refundable) to their account as registration fee. After i did that they asked me about rs.15, 000 for document verification. I didn't had that much of money so i withdrawal from the interview process.
After that i've asked about my refund but they are not responding to my calls.
They even send me an invoice regarding the registration payment stating vistara airlines. One thing i want to know is that this mail is genuine or not.
If not what should i do for my refund. Herewith i attach my invoice copy and also their job offer mail. Kindly do the procedure to look up on this issue.