Reliance Digital — not receiving cashback

Have bought my iphone11 with hdfc bank debit card on 30/12/2019 from reliance dx mini express road kanpur. As mentioned by hdfc bank (To receive cashback of 6000 within 90days from the transactional month end) and additional 2500 cashback of purchasing through hdfc from reliance store. I haven’t received my cashback till now, it is more than 120 days. I have asked reliance, they said to check with bank. Hope this issue gets resolved and cashback will be credited as soon as possible.