India Post — I have received an empty parcel when the weight on that parcel is written 300gms

Address:

10 purvak park navayard nizam pura

I have ordered an tshirt from an online store and when i received it yesterday it was not even there. The parcel was empty and the main bag was torn from the side and was taped from that side with india post tpe amd when i asked the person who sent me the tshirt he did not taped anything on the parcel
When i removed the tape it was torn from there
And the inner plastic bag was also torn from between and reveals that it was taken from that end. Please whosoever is reading it please reply to this and help me. Atleast national services should not be like this how can i trust some other services when the national services are like this
Please do help me.