DTDC — Not received my courier worth rs 6500

Address:

Kolkata, West Bengal

my courier was sent from Nellore to Kolkata about one month back. I was not at home when the delivery boy asked me actual location. I have mentioned him a new address (500 mtr ahead of old address) and he confirmed that he will drop the courier there. But till now I have not received my courier. I have tried to reach out to the customer care and provided my new address. Initially customer care said they will send the courier but for past 15 days they are not replying to my mails. Please help