I have this site application installed since 2014 but I am not using it as frequently. Freecharge is fake service provider as they give advertisement that you will get cashback but when you add that coupon code and it will show that coupon code is applied still you will not get your cashback. As I used many time, I got cashback on my first bill payment and after that frecharge started garbing money.
Though Interface is user friendly but its service support is more then worst.