PayTm is a WONDERFUL app and website used for recharging mobiles, Dish recharges. I am using for the past years and till now not experience any difficulty in doing transaction with them. All the cash back campaigns are credited immediately and you need not wait any more.
There are many codes available and you could get offers for recharging throughout the year. Also they are now into online shopping and there also you get attractive cash back and you can use the cashback to buy the products or to use them to recharge.
So I am totally happy using their services.