HDFC Bank — hdfc bank iphone 11 cashback not received

I bought an I Phone with my HDFC credit card on 8th Feb, 2020 as it was offering a cashback of 6000 INR. It has been more than 3 months and I have not yet received the cashback. Why do you provide such services if you can't satisfy customer on time?
Kindly help as soon as possible and do something from your end.

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