best cashback for 49 recharge

You can get 2% cashback reward for which You need Axis Ace Credit card

1.5% of 49 = 0.735 = 1 (when rounded off)

Re. 1 cashback on transaction worth Rs. 49 = 2.04 = 2% cashback

Refer: [Query] Which credit card gives the highest CB/RP for UPI transactions apart from Neu Infinity | DesiDime

Courtesy with thanks to: sahil1033

This is the best I can think of:) 

so effectively Re.1 cashback for "every 49 spent"

you can recharge on flipkart using supercoins you'll get 10% off upto 20 and pay using slice for getting a chance to earn extra cashbacks