OLX.in - Fake Indian army fraud

I saw an ad on OLX about Activa *g. The price showed was *****. I bargained and he agreed to give it in *****. He asked for the advance money of **** for courier charges. Before giving money I asked some identity proofs of him he had given his Pan Card photo, Adhaar card and registration certificate. I paid him an amount of ****. He has given me the receipt of the courier. He said that it will be delivered to your house by the army transport. Then the courier person asked for the half payment and I denied paying him the amount. Now he is arguing and not sending my money back. I have all the relevant document of him. He said that he is from the Indian Army with *th batallion posted in Nashik and he also referred the head of Army Post office. There was also a guy who called me as a delivery guy. So please help me to sort this complaint as it was my scholarship money given to me in terms of Financial problem. Please do help me.
Culprit Name: Ashish Kumar Khandelwal
Contact No: **********
Delivery Boy: **********