Kolkata RPO — parcel stuck at kolkata custom

Sir my parcel has been shipped from Singapore on 24 july 2019 and receive
kolkata airport shorting office at date 25 july 2019 at around 12:32;48. The parcel is suck at kolkata air foreign rlo building dt 31 july 2019 at 14:48:21. Please do some action to release my parcel. I try more than 7 number but either not attending or some one give one another number. Most of all number not reachable or transfer to other... My name Ngampu Kilong