Amazon.in - Amazon cancelled the order without prior notification

Amazon had a sale on **th april **** for redmi *a mobile. i was happy as i succeeded to place my order < order no ***-*******-******* > . amazon with its amazing services cancelled the order based on payment failure ground on **st april **** without any prior notification. best part for this order is , i was convinced and assured by the amazon customer care that payment is approved and i will get my order on time . here is the snapshot of the chat with amazon customer care on **th april ****
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**:** pm ist gaurav(amazon): hello, my name is gaurav. i'll certainly try to help regarding your concern.
**:** pm ist prem nandan sinha: hi
**:** pm ist prem nandan sinha: i placed an order for redmi *a
i didn't get the confirmation status for it so far
although payment is deducted for it from account
**:** pm ist prem nandan sinha: order# ***-*******-*******
**:** pm ist gaurav: prem, as i understand that you did not got the confirmation regarding your order however your payment got debited from your account, am i right?
**:** pm ist prem nandan sinha: yes
**:** pm ist gaurav: prem, i really apologize for the inconvenience which you have faced.
**:** pm ist gaurav: please be assured that i will definitely assist you in this regard.
**:** pm ist prem nandan sinha: hmm so what is the problem with the order ?
why it is asking me for revised payment
**:** pm ist gaurav: prem, may i place your chat on hold for two minutes while i look in to this for you?
**:** pm ist prem nandan sinha: sure
**:** pm ist gaurav: thank you sir.
**:** pm ist gaurav: prem, thanks for being on hold.
**:** pm ist gaurav: prem, as i have checked the information your payment has been approved from our side so i would request you to kindly wait for ** hours to get the confirmation mail from our side.
**:** pm ist prem nandan sinha: so can i be assured that order is not going to be cancelled ..as this order was placed on sale category
and i dont wanna miss it ..
**:** pm ist prem nandan sinha: there ?
**:** pm ist gaurav: prem, you need not have to worry as your payment has been approved and you will get the delivery of your order by your estimated delivery date which is between **/**/****-**/**/****.
**:** pm ist prem nandan sinha: ok .. i am taking your words as guarantee .. :)
**:** pm ist gaurav: for sure sir.
**:** pm ist prem nandan sinha: thanks
**:** pm ist gaurav: prem, is there anything else i may assist you with?
**:** pm ist prem nandan sinha: no ..thanks a lot
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tdy i got a mail from amazon notifying me that order is cancelled because payment is not completed (what did i talked with customer care in above chat then.. did i not alert the amazon customer care about my concern?) i never heard before from any service provider saying that payment is received and approved and next moment payment not completed. noticeable points : *> payment is deducted from the account for the order *> amazon commits that payment is approved *> amazon rejects the order due to payment incompleteness *> i havn't got the money in my account so far *> amazon sends a mail to refund the money ..but hey if payment is incomplete at amazon side why the hell amazon will refund it. amazon seems to be into a business of fraud and false commitment ?