Indian Post — Stolen smartphone for the parcel

Address:

West Champaran, Bihar, 845438

I am from Bihar and studying in Mizoram University, Aizawl. Recently my current mobile was not working so I demanded a phone from my family and they send me from Indian Post on date 14th June 2016 and I received the parcel on 24th June. I brought it in my room and when i opened it there was nothing I was shocked and surprised that there was some magazines were folded and kept inside then I directly went to the post office and complained about it but they were not ready to believe me...but they said it is happening mostly in Calcutta and Guwahati...And one more thing when i was checking the status of parcel it showed that if is send on 14 and it was received at muzaffarpur then it was dispatched to Guwahati on that day itself But after that till seven days it does not shown any detail.Suddenly after seven days it shows it's status that is received at Aizawl and then it was send to my university.
And my suspicion is that when it was send to guwahati then why it was not received to guwahati ...

My Speed post no. is EF[protected]IN
My mobile no. is [protected]
Please help...I have no other option