Dtdc Courier — Missing document

Address:	Chennai, Tamil Nadu, 600059
Website:	dtdc.in/index.asp

I have a worst experience with dtdc, my tracking number (Tracking No.: C[protected] . I send some bills worth 40K to my friend for claim via dtdc . He was unable to receive it, and it showing return in the online tracking. Past 15 days i was going to tambaram(chennai) office to collect it back, they are telling some lame reasons and i didn't got it back . today the worst thing happened, I came there the boss was not there and i called him via phone, he was so arrogant and provoking me by saying like you can give complaint and it is not going to affect me. I was so helpless . what i can do to get it back ?. I don't want to give complaint, I don't want my friend to loose money . Please help.