HDFC Bank — cashback not received on apple macbook purchased on 6 jan 2020

Purchased a apple macbook from a croma store on 6th january 2020 and was promised a cash back of inr 6000 on the transaction within 120 days from last date of transaction month. It has been well over 120 days and i made the payment via my debit card emis. Of the 6 emis - 5 have been paid for already and last to be paid in month of july 20.