DTDC Courier & Cargo — consignment not delivered

Dear sir i am gyanendra kumar samal i had posted a very important courier from hyderabad to kolkatta, they had assured me it will be delivered within 2 days but its already 8 days it has not been delivered. I tried to get in touch with customer care but no response from their side. When i tracked by consignment it says it delivered successfully, so visited the dtdc lake view branch, kolkatta which was showing as the last destination, but the people over there responding very carelessly. My consignment no. H08163566. Its a very important packet for me please help an urgent basis.