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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.