Naveen Singh Tomar — fraud of oppo f9 pro mobile

I saw an ad on OLX.in a name NAVEEN SINGH TOMAR [[protected] (paytm no.)] selling his phone Oppo F9 for Rs.8800 I talked to him and he shared his number with me we had a phone conversation, and we decided that he will parcel the phone at I'll pay the courier charges. He shared all his document with me like his ADHAAR card, CRPF ID card. He is SI/T in CRPF. After some time he called me and asked me to send Rs1050 in advance and the rest of the amount
after receiving the phone I agreed on that too I sent him Rs 1050 via Paytm.
Next day, the courier boy(Mob.[protected]) called me and ask for the rest of the payment, I sent to the Naveen Singh Tomar the leftover amount of Rs.7000 also via Paytm. Again after some time, he asked me for Rs.5100 for security deposit and now I declined the offer and asked to return my Rs8050 back via paytm he refused because he was saying his paytm mobile number is his owner now he can't make any transaction