HDFC Bank — IPhone 11 cashback not received

I have bought my iphone11 with hdfc bank debit card on 10/01/2020 from electro world in gip noida. As mentioned by hdfc bank that i will receive cashback of 6000 within 120 days from the transactional month end but i haven’t received my cashback till now, it is more than 120 days. I have even contacted the bank they said that they will escalate this issue but nothing happened. My cashback still not received. Hope this issue gets resolved and cashback will be credited as soon as possible.