HDFC Bank — Cashback not received

I have bought my iphone11 with hdfc bank debit card on 06/01/2020 in vijay sales vashi (Navi mumbai).
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 vijay sales, they said to check with bank.
Hope this issue gets resolved and cashback will be credited as soon as possible.

Account number :