India Post — Non delivery of goods

Address:	75206
Website:	www.indiapost.gov.in

I have sent a parcel containing 2 books and snacks to my son in texas, dallas u.S.A, booking date 31.08.1961 i got assurance from booking that the parcel be delivered before 12th of september 2016 as his exams starts on 16th. But till date not delivered. After 14 days tracking showed in usa after that no entry, no response from speed post and instead sending by speed post i learnt that instead It has been sent by registered post. I want to know without asking me why they did so.
I need a proper response. All my *time energy money wasted* who is to be blamed. Now it has been too late