I got scammed.

This thursday while boarding my flight from patna to bengaluru via chennai, I met a guy from manglore he said he is a student from NIT and that he was there to give his exam, he needs help with his flight ticket as his flight from Mumbai to manglore is cancelled and now he needs to book a direct flight from patna to manglore. At first I was hesitant, but later remember I too was stuck once in this position in a new state, although I got help from a distant relative,but that emotion triggered the good in me and I gave him 20k and he said he will return once his mother land from her delhi flight. He was inside the security check so I thought scammers won't come inside this as it requires a lot of security checks, I transfered him money on his gapy and took his number "+918926115418", he said his name is kanna gopi. He will say he will return the money but didn't. His "friend" picked up his call and said he is not there he will come back later, and this went on and today when I threatend them they said do whatever you want to do everything is fake anyways. The number is from odisha actually. And when I asked that I helped you in good will his response was then "I said na thank you and leave the matter why you are stressed about 20k you will get more help kiya na to ab maang kyun rha hai". I want help from you guys does anyone know anyone who can help me find out who he really is so that j can atleast file a strong FIR or fraud case against this man.