Their plans are 222, 333, 444 and 555. So there's a difference of Rs.111 between each plan. So they want to portray that by paying that extra amoint, you get the next available plan for longer base validity. Rest of the plan benefits remain the same.
It means that by doing a top-up of Rs.1000, you will get Rs.844.46 talktime with unlimited validity. You can use it to make non-jio calls (it will be charged at 6 paise/min), international calls and international sms.