Use Freecharge app or web for cc bill payment and only "FREECHUTIL" merchant name is eligible for rewards.
How to get FREECHUTIL merchant name ?
Ans - People having saved cards details in the freecharge app will get FREECHUTIL
IF YOU WILL TYPE MANUALLY AND DO GATEWAY WILL CHANGE MCC VERIFIED
so, just do Rs10 or Rs100 transaction and save your card on freecharge.