Upgrading Sentinel subscription

Hi, after expiry of my free usage trial period of sentinel, I bought the Sentinel Plus package for Rs.50. But now I want to upgrade to Sentinel Pro package. I want to know if i am upgrading my package in same month like from 50Rs to 200Rs, will I have to pay Rs. 200 for upgrade or Rs. 150, since I have already paid Rs. 50 earlier and now just upgrading to Pro.?

You will have the pay the entire subscription fee, Abhijit.

If all my triggers got used before month completion can i renew it in same month