Amazon — Cheating and cancelled the order

Address:	New Delhi, Delhi, 110085
Website:	www.amazon.in

I booked a Moto g turbo white on amazon.in app on27-march-2016
order no[protected] for 4999 after the disc of 7500 and the price was 12499 i received the confirmation mail from amazon on my mail id also i have the screen shots of the order but when i checked next there was no order on the app i tired to call the customer care and they told me that there was no offer by amazon and the order was placed bec of the error on there website but how can it be cancel when its placed successfully and also got the confirmation mail