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.
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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.
We would like to apologize, however, the only way you can reset your upload space limit to 0, is by deleting all your submissions that have uploaded files in it.
I see that your form, http://www.jotform.us/form/62573902625155, still has submissions with uploaded files.
Below are the submission Ids of those submissions that still has uploaded files.
I suggest you download all the uploaded files and submission before you delete it.