If I upgrade for 1 month and do not use all my submissions, what happens to the unused submissions?

I use jotform for my church and can exceed the 10 free submissions per moth some of the time, but do not need them all the time.  So if upgrade for 1 month and do not use all my paid submissions what happens to the remaining submissions if I downgrade?

If you downgrade before you billing period has ended you will remain on the paid plan until the billing period for that plan ends upon which your account will revert back to the free account quota.

The unused submissions will not roll over to the free account