OnePlus India — cash back not credited to my account

Address:

21-4-951, Charmahal, petlaburj, Hyderabad., 500064

Hi team,
This is sumeet chawhan and have purchased a one plus 7 mobile from croma store, attapur on 20june, 2019. As there was a offer if we make a payment from sbi debit card, will get cash back rupees 2000 in 3 months. Three months are completed by this 20th september, 2019 but my account is not credited with rupees 2000.
Request you to please look into it and provide cash back.

Thanks,
Sumeet chawhan
Phone no. +91 [protected]