DTDC Courier & Cargo — Delivered my package at the wrong address

Hi I sent my package to Faridabad and DTDC delivered the courier in Gwalior. How can this be possible if the the address is of a different city and they are delivering it in the different city. It was an important document and I asked them to sent it back by calling on customer care. But I didn't get any response till now. I tried to follow up but the phone number is not reachable.