HDFC Bank — iphone 11 cashback not received.

Address: India

I had purchased my iphone 11 64 gb on 19/01/2020 by mode of hdfc bank credit card. At apple store they informed me that you will recieve your cashback of ₹6000 within 120 days in your credit card statement. But its been 126 days from purchase date i have not recieved my cashback yet. My 4th emi is been generated by bank but not yet they credited any cashback in my unbilled transactions also till now. So please take neccesary action against this and solve my problem as soon as possible.