Paytm — not taking cash back after using promo code

Address:	New Delhi, Delhi, 110062
Website:	paytm

Hi mam/sir,

I am writing this mail regarding cashback. So problem is i pay my electricity bill through paytm by using promo code which is (Firstpay) and it is applied but i dont get any cashback from your side to my paytm wallet. I also attach some attachments please see and solve my query asap.

Thanks
Rahul bist