HDFC Bank — Didn't received cashback for purchased iphone 11

I have bought my iphone11 with hdfc bank credit card on 04/02/2020 from unicorn infosolutions. 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, 120 days are completed now . I have asked in unicorn infosolutions, they said to check with bank. Hope this issue gets resolved and cashback will be credited as soon as possible.