Firstly I would like to tell u that freecharge is multifunctional site or app for various payment. I always prefer freecharge for recharge because it always give a huge cashback for mobile recharge. GENUINELY I get free cash in my freecharge wallet by them.
Freecharge always send a promo code on the registered email ids and when u go for recharge use that code to get a huge CASHBACKS.
PROMOCODES are like that - FV50, CS50, DEC50, CASH50.
and the time for one recharge is done in few seconds if we have freecharge balance.