Indigo Airlines — RE: Flights complaint loss of baggage

I was traveling from mumbai to patna, on 30.12.2021, I boarded the flight of indigo through gate no.47b, in the lobby the announcement was made so sudden and delayed that I left my shoulder bag, though I remember that I have left my shoulder bag, I ran to get it, but was not allowed and the crew members said that will be send to my destination airport at patna after informing the loss and found dept.i did that...I got a reference no.also as they got my shoulder bag, my ref#28046, but they are not ready to send it to the patna airport.I need my shoulder bag as it was having few docs along with a Raybam sunglass .