DTDC Courier & Cargo — product has gone theft

Address:

Palakkad, Kerala, 678006

I have couried jiofi (Router) from palakkad (Kerala) to mulbagal (Karnataka). But the courier came back with the reason that the address is invalid. When i got the courier the i found it's weightless and when i opened it the product was not there. Luckily i opened it in front of the courier officials. When i asked for it the officials misbehaved saying that if you challenge it in the court also you won't get any justice. It is very painful to hear such comments from them. Please give me justice in this issue.