FPL Hyundai — my belonging missing inside the car when I have for service

Address:

Chennai, Tamil Nadu

Tn05 6727 - hyundai xcenr red - was given service on 20th april 2019.. I had a 32gb pen drive with important documents in it... Which was not available in the usb port when i got me car back.. Asked the service manager mr murugan (Fpl vanagaram) and the driver prem but they denied my claim..

I bought this car from fpl — 2015
Till now spent servicing only at fpl - vanagaram..

I know somebody has flicked it inside the campus of fpl vanagaram — need that back since it has important documents