HDFC Bank — Cashback still not received for an IPad purchased through Smartbuy

Address:

Kormangala, Bengaluru

Hi,

I had purchased an IPad Pro 12.9" through Smartbuy Imagine Store link (https://smartbuy.myimaginestore.com/) in May'2022. At that time, there was a cashback offer on using the HDFC Credit card of Rs. 4000 which was supposed to be credited in 90 days.
It's been more than 100 days and still I have not received any cashback credited to my credit card.

Please help in how can I check the status of the cashback.