India Post — Not deliver my artical till today

Address:

Jamnagar, Gujarat

i send a my artical by register post..and i dispatch on 13 february and its reach INDRAPRASHTHA H.O. NEW DELHI on 17 february but from INDRAPRASHTHA H.O not deliver my artical till today...and this artical most important for me because its My EXAM form...and i must have submit before 1st march..but only 2 days remaining and by careless pf indian post...its not deliver..if My artical not deliver in 2 days..then i will complain in POLICE and taken legal step against INDIAN POST OFFICE..because its my EXAM form..so please deliver fastly..otherwise i will help from INDIAN TRIBUNAL...