What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
I'm not quite sure if I understood your concern correctly. As long as you didn't set any form limititation and your submission limit is not yet consumed then customer will be able to send forms from your website. You may take a look at this guide about setting unique submissions. http://www.jotform.com/help/64-How-to-Set-Unique-Submissions-on-a-Form
I hope I was able to answer your question somehow. Let us know if there's clarification.