Big Bazaar / Futurebazaar / Future Retail / Hometown — Refund and Cashback not received yet

Address:

Opulent Mall, Ghaziabad

I placed one online order at BigBazaar on 08-May-2021, with following details:-
Order id:[protected]
Total value of items ordered: Rs. 2, 015/- (screenshot attached)
Mode of payment: Credit card (screenshot attached)
Offer: Rs. 300/- Cashback on order above Rs. 2, 000/-

Now my concerns are follows (before writing this mail, I tried customer care no. [protected] multiple times, but no answer):
1. On next day (09-May-2021), I received INCOMPLETE items of total amount: Rs. 1, 326/- only
[TWO bags of Aashirvaad Atta (Wheat Flour) amounting Rs. 689/- were not delivered].
2. Total refund amount Rs. 689/- not credited yet in my account. Pls update on this.
3. Rs. 300/- cashback not credited yet in my account. Pls update on this.