DTDC — Courier delivere to wrong address and they lost it

Address:

Gurgaon, Haryana

Dear Sir I want to register complaint for non delivery of my courier which was sent through DTDC. It was having important document. DTDC(Tracking number --: Z[protected] delivered it to wrong address. Instead of delivering it to my address of Sector 22(B) they handed over to someone in Sector 22(A). When i checked the status it was showing delivered. I suspected that it got delivered to wrong address and i myself went and ask the receiver but they are unable to find it now. That courier was having parking sticker of my office premises for which i have to pay heavy fine. I want to held DTDC responsible for this loss. I tried several times their number but they never pickup the phone. Kindly help. Regards Shailendra