Indian Army — Fraud in the name of Indian army transportation

We had seen a ad on carwala, we called the seller for test drive he said he works in army and car is in Hyderabad I will send it to Bangalore you can check the documents & car if you like it I'll do the transfer.
He charged 3k for transportation which he said is refundable later in the morning next day a person called manjeet called saying that he is from Indian army transportation, and asked to pay 10% of contract amount which was 19k we had send 16k as mentioned by the seller later he asked to pay 19k in one shot we took a Chance and paid
But again he asked to pay insurance amount then we felt something is wrong and we checked his I'd we got to know there are so many fraud from this... Kindly help