India Post — lost the item in the packed box

Address:

New Delhi, Delhi, 110024

We are authorized dealer of hearing devices. On[protected] we sent some
Accessories cost of 48000 when the addressee received the packed it was
Packed but item has been changed by someone and placed a t-shirt bought form lajpat nagar delhi. We request to do needful and help us to get our accessories back. The post office staff not telling us any solution about this.
Our company details -
Sphear speech & hearing clinic
G 32 basement lajpat nagar 3
New delhi 110024
Ph[protected]/46

Receiver details
Rajatabha dutta s/o rajashish dutta [protected]
Bc 16/4, brahmaputra apartment satgaon road patharquery po udayan vihar pin 781171 guwahati assam

T - no ed[protected]in