Amazon India — Cancelled my order without any reason

Website:

amazon.in

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I placed an order on amazon but they cancelled my order without any reason, I have paid using my debit card . I placed order on 12:45 pm 27/03/2016 (IST standard time) of moto G turbo of Motorola company of MRP. 12499 but I used promo code so I got it for 4999rs. but they cancelled my order, whereas my order was already confirmed and I received a estimated delivery date and confirmation email already. When I check the status at 7 pm I got to know that it is already cancelled. I was very happy that I am getting a new android phone of a big company at very low price that is in my budget, so I can sell my old phone and get a new one, but when I saw that it is cancelled so I feel very bad and it has a very bad effect on my mind and I felt very awful . So, I request company to give me my phone that is ordered at a offer price, that is given earlier.