Grofers — Cashback not received

I had purchase grocery from grofers thru order no. ORD[protected] and made the payment by Paytm with cashback offer and applied coupon code as well. However I have not received cashback so far and when I contacted with grofers they asked to contact Paytm and they are refusing for cashback.

It's very strange situation even my earlier cashback refused as I didn't applied coupon code and now with order ORD[protected] when I applied coupon code now neither grofers nor Paytm providing cashback.

If they didn't adhere cashback offer than why they advertised and asked to make payment thru this channel for cashback.