HDFC Bank — cash back not received

I have bought my iphone11 with hdfc bank credit card on 06/10/2019 in sangeetha mobile store bangalore. 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 220 days. I have asked in sangeetha store, they said to check with bank. Hope this issue gets resolved and cashback will be credited as soon as possible.