India Post — non delivery of registered parcel since last 2 months

Address:

Kolkata, West Bengal, 700021

I have booked a regd parcel on 24 oct 2017 with consignment no cw[protected]in.

Even after around 2 months, the parcel has not been delivered till now.
I had tried to contact the post offices and other related postal departments in kolkata and amritsar but still no one has been able to resolve the issue.

I have also filed a complaint with no [protected] & [protected] but still any postitive resolution is awaited.