Indigo Airlines — Job offerings

Hii i also got a call from man power group regarding job openings at indigo airlines. First she said me to give 2000 for registration. I also paid 2000. Then she told me that your registration is done and i will fix your interview. On the same day she connected to one person he took my interview through telephone. After my interview then after 1 day she told me that you are qualified the interview. Again she told me to give your certificate and also give 5500 amount for certificate verification process. Am also paid 5500 for that. Then after 5 days gone she calls me and told me to deposit an amount of 13475 for security money and your joining date will be this. Am also ask him security money for what? She told me that company will take that amount from as security purpose that you have not leave the company for minimum 6 months. And she also told me that all these amount will be refunded to you in your salary. Here i upload that letter which i got from them. So kindly check it once whether it is true or false.