Amazon India — prepaid order get cancelled next day due to out of stock

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Highly pathetic service by amazon.
I had placed my prepaid order, and next day i got sms that 3out of 5 is been cancelled. When i ask reason to customer care then she was blank.. She had no answer for this, first she she it's a bank fault so that ur payment not done successfully, when i assure that i already received bank sms for payment deduction and so it's amazon fault because not all item is cancelled. Then she accepts yes it is may be out of stock so ur order been cancelled.
Why amazon showing products available in their bucket if they haven't. Pathetic service