Kolkata Foreign Lcao — excess delay in delivery of parcel, no update and no response since from 1 month

Address:

Kolkata, West Bengal, 700001

Tracking information is stuck since 1month. Last update shows the parcel is at transist on 31.12.2019 and next office is kolkata sorting office.
Why there is so much delay and no update on the india post website?
Tracking number:rv[protected]cn
Nearly 2 weeks have already passed by with no update and the items are still with kolkata customs. Seriously this is extremely annoying.