Airports Authority of India — about my refund of amount 16400

Hello sir This is sadath mohammed khan i have got a call from the recruiting office from the recruiter by name nisha she told On behalf of airport athourity of india they are hiring for the post of computer operator assistant manager and they conducted the rounds and took 16400 rupees in the name of suraj kumar as acountee and said they will send all the details through courier they have also sent intent of letter to me through specifying the Hr name as Shikha dayal but i did not receive my courier and now they r saying that my profile might have got rejected and so they will refund my amount on 20th of this month but i have not received my refund and the numbers from which they were calling is switched off i request you to take serious action on this and i want my refund as soon as possible i can give you all the details they sent me and i have recorded calls of them
they said they are from pune office of airport athourity of india