Indigo Airlines — I lost 1000 inr from my wallet in my luggage

I was travelling from delhi last evening where my bag which i gave for check in luggage has around 1000 rupees, when i returned back to ahmedabad and collected my luggage and returned home i noticed that the wallet inside my bag was open with no money inside, not a single penny was left and my open wallet indicated that someone took out the money from my bag. I want to lodge a complaint againt indigo as it should be the airlines reponsiblity to take care of my valuables when i checked my bag in.