Amazon India — Moto G Turbo cancelled

Address:	Dhanbad, Jharkhand, 828111
Website:	www.amazon.in

After getting a promotional code over internet I ordered a Moto G turbo (white) for ₹4999 from amazon.in yesterday at 12.46 pm. After 2 hours and 25 minutes i.e. at 15.11 pm I received an email from amazon that the estimated delivery date is 01/04/2016 but at 18.36 pm I again received an email stating my order is cancelled and the amount will be refunded in 3-4 days. Today I got another email from company stating " we regret to inform you that your order for Moto G Turbo (ASIN: asin: B019FWXIX4) was processed at a discounted price due to technical issue. As a result, the order will be automatically cancelled."
If it was a technical issue then why the code was applicable only with white colour phone and not on black colour. Amazon is hoodwinking everyone.
I spent over an hour for a placing a successful order. It was a prepaid order my money is blocked for days. How they can do such fraudulent activity.