India Post — speed post not delivered, even after 15 days

A speed post booked on 30-may-19 reached at nsh new delhi on 01-may-19, however, its not delivered yet. Its been more than 12 days and i havent got the package yet. I tried complaining through their complaint portal, email, calls, and even twitter, but no one takes responsibility for it. Nsh delhi dont even pick their call. How ignorant they are. I dont who appoints these ignorant people in such jobs. I dont even know where my package has gone. Either india post officials stole it or misplaced it. I dont know what to do. How irresponsible people are in india post delhi that they dont even bother to take their job seriously.
I dont care about anything right now, just give me my package asap. Thats it.