Srilankan Airlines — stolen my money from the hand luggage

I was a one of passenger who was flying back to Colombo from Jakarta at Indonesia on 18th January 2018, Flight Number Sri Lankan Airlines UL365, Seat 28H, While it was flying to Colombo I lost my money USD 12000, it was realized in airport after landing the aircraft at Katunayake Bandaranayake International Airport. Immediately I informed to Security unit at airport and asking to check all the CCTV covering units, According to the CCTV Feedback, these were nothing happened at Airport premises then after I was made a complain regarding this to Airport Police station, so that I am very very sure this was happened in the flight, because I was confirmed my money was available with me at Airport Jakarta before boding in to the flight, I kept all my money in my personal bag which was kept in the compartment over the my seat, this flight was so treble on that day because got 4 hours delayed after on boded passengers to the flight due to a technical fault, it was departured 4 hours delayed to the schedule time so I want to know what is Sri Lankan Airlines responsibility for this incident? I already made a complain over the phone to the Customer care unit but still there were not any feedback and action made for this, this is huge money I lost in on boding. According the Police and Airport security unit these is a chainees gangster set doing this theft in the flight, if Sri Lankan Airlines not taking responsibility for this incident and unable to provide safe flight to their passengers I have to make a call to aware all the media units and share this incident to all social medias. I need immediate respond.