Indian Army — Fraud through OLX

Hello team, i seen a add on olx for split ac by person name dharam singh, he give his contact number and whatsapp no and deal is finalised in 13000/-
After having chat he says he is from indian army and working as a petrolling staff, and want to sell ac due to transfer and provide pics, invoice, his adhar card and canteen card.
After that he insisted me to pay 2150/- for army parcel charges and postman will deliver tomorrow it to my home address.

After making me lot of convince in name of indian army and soldiers. I payed him 2150/- as the requested account is also saying army transport charges, he shared a receipt of army parcel.

After that a guy called in name of army deliveryman and asked me to pay 5150/- as a gps charges i payed the same and now he was said that pay 5100+ 50 different entry and confirm me cash refund at the time of delivery i payed the same as he made tounge promise of soldiers. After 1/2 hours delivery man called me that need to pay 8230/- amount to be deposited as a army security charges before delivery and let me know that he was reached near 10km of my house, i argued with him and the person called dharam singh than lot of his convince i have made the payment.
I have payed total 2150+5150+5100+50+8230, and now his delivery man demanding to clear 11500/- army refined amount and to be pay all the amount in cash refund at the time of delivery and lot of arguments with dharam singh, i refused this time to pay and he said cash will refund after 100 days and switched off his all contact and whatsapp.
All payment made in paytm bank account[protected].

Please suggest what to do, is any possibility to get my money back and complaining process for fraud.