India Post — rc book not received from post office

Address:

Saki vihar Road, Mumbai, Mumbai City, Maharashtra, 400072

Worli rto shipped my rc book & they gave shipment tracking number. Persons in post office says they do not know the status of shipment. I checked with rto again, they said it is not received back from post office.

Shipment tracking number - ea[protected]in
Post office - india post office, saki vihar road, mumbai

Shipment tracking site in post office says - the bag is received & opened. But there is no update further to that

Now i dont know whom to approach to get my rc book. Please help.