Amazon India — Moto g turbo order cancelled by company

Address:	Mumbai City, Maharashtra, 400053
Website:	Amazon.in

Today I ordered a moto g turbo from Amazon under some promotional offer 60% off. Order was successful and they also debited money from my bank account. Few hours later they send and email about refund of the money even though I did not cancle the order. On calling customer care they saying the offer was placed mistakenly so u will not be getting the delivery. And also refund will take 4 days to transfer. Such a huge company is not expected for such mistakes and they cannot hold my money for 4 days without any reason.
I have email for confirmation of order that I placed and of successful payment also.