India Post — Speed post not delivered BUT Status is showing delivered

Address:

AT LAKSHMIPUR,RAJAUR, VIA-GARHPURA,BEGUSARAI-848204

It is with reference to my request in respect of non delivery of speed post letter booked through Consignment Number JA[protected]IN . The letter has not been delivered yet but status is showing delivery confirmed. It defeated the purpose for using the Speed Post Service of Indiapost. Kindly help, and let me know the where is my speed post letter.
It contains my important documents and needs to be deliver as soon as possible.