After paying with Paytm,weren't you redirected to Jio's site ? I was and i saw that the offer will start from April 16th.
You should have use PhonePe (150 cashback in bank account on 300 and above) or Jiomoney (Rs 50 cashback four times each user).I am planning to pay via Paytm website because it gives 30Rs off.
Paytm does not take u to operator page if paid via their website.