Want to recharge unlimited pack over data pack

[Tejas01]

I have Ru 48 data pack which has 18gb cumulative data pending and is going to expire today. I was thinking of recharging Ru 149 unlimited which givrs unlimited calls and 2 gb data. So will the 18 gb data which is expiring today be exhausted on recharge of unlimited plan? Or will there be 2gb alloted in addition to 18 gb data. Don't want to lose that 18gb data.