I have been recharging my mobile from paytm from past 2 years through my debit card if you want to recharge for 50 everybtime they will give you the cash back. I am using mts postpaid datacard so I used to pay bill from paytm the bill is about 1100 in that they will give 20% cash back.
So I just need to pay 900 remaining 200 will be credited to my account . so that paytm will saves your money. and paytm products also nice and less expensive .