Grofers — cashback not received

Address:

560037

I have placed an order using grofers on 9th of august.
The order amount was 1515 rs.
While paying the amount in the payment options there was an offer.
The offer was if i pay using aritel wallet i will get 10% cashback (Max of 150rs).
I have made the payment using airtel wallet.
But i have not received any cashback till date.
When i have contacted grofers customer care they said to contact airtel customer care.
When i contacted airtel customer care they are saying i am not eligible for the offer.
I want to file a complain against grofers for showing the offer which was not there from airtel.
I have made the payment under impress that i will be receiving cabbage.

My contact details: [protected] (Registered with grofers with same number)