Form is spammed by a bot

Help :) My account got spammed and suspended? I'm at my 'max' but it was actually a spammer that found my jotform. How do I reactivate my account (without paying more because they weren't authentic submissions) and how do I prevent this from happening again?

Thank you for contacting us.

We have banned the spammer's IP address and reset your monthly submissions counter.

Please get back to us if you notice the issue again.