India Post — postman not delivering mails

Address:

East Delhi, Delhi

I am a resident of A 14 s delhi police apts mayur vihar ph 1 delhi 110091 my name is Naresh kumar i am
residing at this place for the last 20yrs and receiving mails regularly its only for last 2 months or so we are not recieving mails so i went to my post office at patparganj where ifound my postman who told me that i am transferred to another place and shown me new postman. When ienquired him he said i came only two days back. I posted a lettter from the same po to my house 1 month has passed but i didnot recieve any letter. This post man deliverd a very imp call letter booked on 7 may speed post on 26th may. This postman is deliberately delivering mail.pl do the needful in this regard.