Paytm.com is a very bad website and there is nothinf worse to use paytm.com or their paytm app.They are totally useless.
Once I paid my mobile bill through paytm.com but my bill was not updated for 2days and for that reason my due date was gone and my mobile line w as disconnected even I had paid the bill.
Then I got a mail from paytm that my transaction was failed and my money will be credited in next 48 hours. Totally sick very bad service.
Paytm.com also gives various offers like cashback and offers and deals on various purchases through their app and website.
But the deals are also very cheat as their deal are expensive than other websites and in that expensive deal they offer discounts.
So I would say use paytm at your own risk