Restore deleted submissions

I like to know if any of the submissions was ever deleted , and if i can get i back?

If so how ?

If you delete submissions using the "Delete" buttons in your submissions page, then you won't be able to get them back. The data is owned and managed by our users, if you decided to delete them, they will permanently be removed in our servers without any backups. You'll see a warning message when you delete a submission:

Also, we do not have a record if a submission has been deleted, however, you can check your account's activity log if there are any suspicious and unauthorized access or changes made in your forms: https://www.jotform.com/help/370-How-to-View-Your-Account-Activity-Logs 

The only thing that you can use as a reference for the deleted submissions are the email notifications sent to you.

If you accidentally deleted a whole form, it is still possible to restore it as long as it is not purge. Here's a guide about it: https://www.jotform.com/help/134-How-to-Restore-Deleted-Forms 

I hope that helps.