Amazon India — Cash back denied

Address:	New Delhi, Delhi, 110032
Website:	www.consumercomplaints.in/new_complaint

I purchased RBL Card from amazon vide order number[protected]. On this order cash back was eligible. Amazon also confirmed after one month of placing of order saying.
"Congratulations! Your Amazon.in order placed during the Great Indian Festival (Oct 1-5, 2016) entitles you to a HDFC cashback.
The cashback will be credited to your account by January 5, 2017."

So i am eligible for cash back.Later It was denied by amazon .

In fact there was anamoly in conditions of amazon and from condtions of bank.

But later amazon denied cash back by showing condition of banks . If there is anomaly in condition of amazon and condition of bank then why customer should suffer for anomaly of conditions of amazon and bank.
In fact was allowing amazon pay back on case to case basis to hide anamoly of conditions . Amazon allowed full amount as Amazon cash back ( Rs 1483) to my collegue Mr Rahul Aggarwal ( email id [protected]@hotmail.com ). They also allowed Rs 250/- against my claim of Rs 1483.