Infibeam — Order not delivered. Delays with no explanation

Address:

Mumbai City, Maharashtra

I ordered a Lumia 930 on the 5th of March. Full payment for the product was made. Promised delivery date was the 11th of March. The phone is yet to be shipped. . Today is the 12th of march. Complaints about the same are ignored, fall on deaf ears. Customer service is terrible. How does one hold the company accountable?