India Post — china post parcels stuck in kolkata

My Parcels are stuck in Kolkata PO - RY[protected]CN and RY[protected]CN ...
Why is Kolkata PO so slow at processing orders?
They take months to process China Post orders to Bangalore whereas Chennai to Bangalore takes few days only.

I'm disappointed by the efficiency of India Post in Kolkata.
They should be able to process parcels quickly and get it delivered quickly.
India Post should enhance their delivery process so that citizens can make maximum use of their services and drive growth for the company.