Amazon India — payment was initiated, order was placed then too they cancelled my order

Address:

Mumbai City, Maharashtra, 400001

I ordered iphone xr 128gb on saturday night date 28th september 2019 using emi as the payment option, i even got the confirmation call from the bank, payment was also initiated, in the application they even showed me that the order has been placed and delivery was to be on date 30th september 2019 but they cancelled my order for what i have no idea, please sir help me this.