I had recharged my wife's number with Prime & ₹149/- (3 times) in March. Yesterday I recharged again for ₹303/- and today got the same SMS confirmation which I received saying "Thank you for being a founding member of the Jio movement.
Enjoy complimentary Jio service for 3 months with JIO SUMMER SURPRISE".
I had already recharged my own number with ₹303/- (3 times) in March so I got the message thrice since 1st April without doing anything else.
This post is for those who recharged with ₹149/- plan & are still in doubt regarding what will happen if they recharge ₹303/- now. All 4 recharges are queued under MyJio app in chronological order under my plan.