India Post — LOST speed post document from JAPAN

Address:	122001
Website:	www.indiapost.gov.in/CorporateComplaintRegistration.aspx

I have sent very important document from Japan to one hotel in Gurgaon sector29 by speed post on 11th Dec. The status showed "Delivered" on 17th Dec from industrial estate S O gurgaon but actually nobody received any document on that day and still my document couldn't be found. I'm really confused what i should do to solve this matter. I have contact to customer care but all staffs of india post are useless.