Olx India — Second hand cycle

This incident is of 06/06/2021. Someone posted an ad on Olx to sell second hand cycle for ₹5400/-. When i left a message to send me more pics of cycle, that fraudster whatsapp me 4-5 pics and video clip of cycle. He posed himself as Indian Army personal. He told that he is posted in Verna near Airport.
He told that he had purchased this cycle for ₹16000/- and is just three months old. Since, he is transferred to another city, he wants to sell it immediately and at such low price. He even sent me copy of fabricated Canteen Card in the name of Anand Kumar Singh issued by भारतीय थलसेना.
He asked me remit atleast ₹2500/- so that he would courier cycle through Indian Army Parcel Car and Bike Transport Service. He sent me bank detail of a person named Rajeev Nayek a/c No.[protected] IFSC: PYTM0123456. He told that this account number belongs to courier service person. I don't know why i didn't notice such stupid thing that any Govt Dept can not have bank account with Paytm.
It was quite stupidity of me. Without thinking twice, i remitted ₹2500/-. After some time, that fraud guy sent me fabricated challan copy. After seeing this immediately I understood that my money has gone. Even then that fraudster told me to pay another ₹1499/- saying that without remitting this amount, courier will not happen. Then i said no and asked him to pay my money back. Then that person said that you are not having faith on Army personal. I told him that you are fraud and i know it. Then he told that since you called me a fraud, then end this talk. He refused to give me any amount.
Entire episode lasted around 3 hours. I got a message from Olx after 3 hours that please dont contact the seller or remit any amount as he is a suspicious person. I ask Olx that why did you send me message after such delay. Why there is no mechanism to ascertain that only certified seller is selling on your platform. Why your system is so weak that so many people have been duped and looted. It is a loot. And i blame entirely olx for all these fraud instances.