HDFC Bank — Not received 6000 cash back from hdfc

I have bought my iphone11 with hdfc bank debit card on 01/01/2020 from
Iplanet-apple premium resellers, inorbit mall, whitefields, bengaluru, karnataka - 560066
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 in store, they said to check with bank. Hope this issue gets resolved and cashback will be credited as soon as possible.