Online FIR on car agent and its effectiveness

Hello sirs, I am from Mumbai but native of karanataka. I had a car which I wanted to sell. In Feb'20, I handed my car to an agent who is well acquainted (same agent through whom I took car 4 yrs back) with an understanding that I would go personally once he finds a buyer for transfer and collection of amt. The car got sold in June (post lockdown) but due to lack of transport I couldn't go. The agent suggested to courier signed forms with RC with understanding of crediting amt to my account. The vehicle got sold and transferred but agent paid only 50k in 3 months through NEFT and now not picking calls or responding. Still 135k is due. I got confirmation from buyer that agent had taken full amt. I have agent's call records and messages. I tried to connect agent through others but got no success. Since travelling is still risky due to covid, can I lodge FIR through online? How effective it is? Or suggest to go and try to recover else lodge FIR physically? Pls advice as I under stress. Thank you in advance.