India Post — parcel not received by recipient but status showing delivered

My parcel. With tracking id ck[protected]in reached musheerabad po (In hyderabad) and is showing as delivered to the recipient. But the recipient has confirmedly not received it. The form for consumer complaints on the india post site does not pick up the recipient po even upon selecting from the list, and it's not possible to submit a complaint that way. The helpline says call the po, and it is very difficult to get a clear response from the musheerabad po via phone. Please help.