DTDC Courier & Cargo — Missing item in my courier

I sent a courier containing various items to my inlaws living in Kolkata through DTDC courier. The package included a packet of 500gms of Goan kaju. But this packet was missing after the courier was received by my inlaws in Kolkata. In addition to this, one more packet of mixed dry fruits was opened and could be seen as consumed halved. This is total insult to us and demeaning our emotions. The consignment no of the courier is M20765786. Kindly resolve this issues urgently. This is a mental harassment to me and my family.