India Post — my item were stolen from packet

Address:

Nagwara bangalore, 560045

Parents send me some item including snacks via indian postal. Initially it was 2 kg, it took 8 day to from dabra to bangalore.
The packet was cover with clothes
And when i get it was torn from down side, someone stole snacks from it and try to close it using plastic tape i called postman he blamed my pg and asked me to check cctv and cut the call.