HDFC Bank — cashback not received

Address:

Gwalior, Madhya Pradesh, 474001

I had purchased a samsung galaxy a6 plus smartphone using hdfc credit card, 2000 rupees cashback offer on 30/08/2018
The offer stated that within 90 days the cashback will be credited in the bank account but it's about to over 90 days and i have not received the cashback and hdfc helpline are not providing sufficient details
Its a fraud!
Hdfc bank is a scam.
Please contact me on [protected]
The loan is registered to [protected] number
My email id is [protected]@gmail.com