India Post — USPS item departed New Delhi airport a month ago but not delivered in Kolkata

There is a huge delay and lack of tracking updates for a month now for a small package that I shipped First-Class from the US to Kolkata.

When I shipped from the US they said it would take 10-15 days total since November 10th when I shipped. With the USPS tracking the item shows as In-Transit from New Delhi to its destination since November 15th:

"Your item departed a transfer airport in INDIRA GANDHI INTL, DELHI, INDIA on November 15, 2020 at 9:51 pm. The item is currently in transit to the destination."

Wrote also an email to the West Bengal support ([protected]@indiapost.gov.in) 10 days ago, no response yet.

Would really appreciate an update on this matter.