DTDC Courier & Cargo — Product not delivered even after 1 month

Address:	Bokaro, Jharkhand, 827001
Website:	www.dtdc.in

I shipped a product via dtdc on april 28th 2017 but it has not been delivered as of today (23rd may 2017). There is no response to my several e-mails. Also the twitter account of @dtdcindia is not responsive. Called them several times but everytime they are pushing to the next day, saying the product will be delivered the very next day. They are confessing that they received the email but they do not want to reply to it.

If someone can help me to get the nodal officer contact or any other escalation contact.