Amazon India — Not receiving cashback

I purchase a iphone 11 64gb during amazon great indian festival. i read a term condition and then i booked my product, as per term condition 10% cashback is there on hdfc bank credit card. i received 1750 instant cashback on hdfc credit card . and term condition also says CREDIT CARD customer will get bonus cashback 1250 rs if customers spend order 30000 and above on single transaction. i am attaching the proof also. its clearly mentioned.so i didn't receive 1250 cashback and customer care agent also saying you will not get.