HDFC Bank — did not received any cashback even after 90 days

Address: Hyderabad

I have purchased jewelry in reliance jewels on 8th december 2019 and there is an offer with hdfc credit card/debit card -
I have done a transaction of rs 25000 each using my credit card and debit card and should get a cashback of rs. 2500 for credit card and 2500 reward points for debit card within 90 days.
It's been 180 days since then, still, i didn't receive a cashback

T&c-max cashback up to 2500 per card.

Resolution - i am expecting my cashback as i have already completed 90 days.

I have been trying to contact customer care from the last 3 months but couldn't.