Indian Army — Iphone 13 pro max

Someone named Bhavani Singh Chaudhari whom I got contacted with in olx and later in whatsapp. He told me that he is in Indian Army. I wanted buy the mobile Phone that he had posted in Olx. He asked to pay an advance of 10k but out of the Indian Army I paid him 1k. Inorder to make me believe he sent me his aadhar card and canteen smart card and bill of the phone as well as courier details invoice with Indian Army Postal letter head. It happened on this day. 13/05/23. I am not sure whether he is genuine person or a fraud person. Anyway with like this person we must not loose our trust in our Indian Army. So please do take an action. I would like either my money back or the product. Dear sir please help me. I will provide you with all the details i have.