Freelancer — cheating me by saying that I selected for the job of air ticketing

Dear users i am a registered candidate of shine.com. On last day i got a vaccany announce of cabin crew and airticketing. I applied for it. One of the lady named shivani call me and ask me to pay the amount of 1750 to their account. The account holder name is sheavendra ojha and i paid the same amount to that account after that they conduct my online intervieiw and another person call me ask me to pay the ammount of 5000 as the amount for certificate verificationand i refuse to pay the amount. Now they says me the amount that i paid is not refundable. Shine.com have the obligation to my amount because loss i occured because of registering in shine.com