Srilankan Airlines — lost my iphone 6

Website:

www.srilankan.com

I lost my iPhone in flight UL198 (seat no.17B) today in the morning.
As soon as I got down of the plane I realised that I left my phone on the seat. I rushed to my seat that very moment but there was no phone. The staff and cleaning team said that they found none. I am damn sure of leaving it behind on the seat. I reported it to the baggage services counter but to my dismal they said that they can't help me on it nor did they register my complaint. There is no one to help here. Phone if found, please contact at [protected]