Amazon India — Moto g turbo promised offer not fulfilled.

Address:	Bangalore, Karnataka, 56055
Website:	www.amazon.in

I got a promo code on amazon from a friend. I bought a "moto g turbo 16gb white" phone for 4999 on 27 march 2016. The promo code gave a discount of 7500 rupees, and i paid the remaining 4999 using my amex credit card. While ordering they said that delivery date not set, on the next day i was informed that i will receive my phone by april 2nd 2016. Now they are saying that there was a glitch in the system and the promo code was a 3rd party promo code(Which was working on amazon website apparently) and cancelled my order.

Promo code used : gyjqj3yw (Worked only on white moto g turbo)
Amazon username: [protected]@gmail.com
Order number:[protected]
Order date: 27th march 2016
Promised estimated delivery: 31st march 2016 - 2nd april 2016 (Email on 28th march 2016 2.44 pm)

Refunded order email received on: 28th march 2016 10.05 pm