Indian Postal Services
Non delivery of a Registered lr sent on 5th Aug from India tomUSA

I have sent a registered letter to my son residing in 218, Silver bell Ct, west Chester, PA, USA, 19380 on 05-08 from Hyderabad in AP, India. I have enquiredwith my son on 24-08 about receipt of the letter containing an important certificate of my son. Registered lr NoRR653453066IN.When enquiredwith the post office where I have regiserd that lr they told me to give a complaint. I want to know what is the status of the registered lr and when it would be delivereed to my son.