HDFC Bank — for hdfc cashback on purchase of iphone 11

Address: Lucknow

I have purchased iphone 11 before 5 month from inspire apple store nagpur and was entitled for 6000 cashback, its been more than 5 months and i have not received cashback for the same i have called the pine labs once but they didn't resolve my problem so i am here for the complaint i also i have the bills and receipts for the same hoping for resolution