I usually use paytm for my mobile recharges and dth recharges and most of the time when I apply cashback or promocodes it doesnt work and each time I have to call their customer care which is not toll free and they dont usually resolve customer problems and I end up frustrating with this app. 80% of the cashback or promocodes are just fake and only used to canvas customers. I dont really recomend paytm as there are many others in wild for the same!