Don't recharge ₹399 more than once as it will provide 84 days for the first recharge only. Instead recharging with ₹309 will provide 56 days for the first recharge.
Customer care told me not to do multiple or additional recharges at the moment as more lucrative festival offers are on the way.
If anyone has multiple ₹149 or ₹303 or ₹309 - after recharging with ₹399 you may override and switch to ₹399 anytime by using "Activate" button.
I have further found that the higher value of queued recharges gets activated first irrespective of the order of recharge. Did anyone else also experienced similar behavior?