HDFC Bank — IPhone 11 cashback not received

I have bought my iphone11 with hdfc bank debit card on 1st february, 2020 in apple store logix mall, noida, sector -32. As mentioned by hdfc bank (To receive cashback of 6000 within 120 days from the transactional month end) i haven’t received my cashback till now, it is more than 120 days. I have asked to store, they said to check with bank. Hope this issue gets resolved and cashback will be credited as soon as possible.