By default, enrol type forms are setup with a 7 day reminder that is sent to the primary guardian if it is not yet completed.
If a guardian reports that they received the reminder despite already completing the form, there are a few things you can check:
Lead profile - Forms section
Check the lead profile to see if there is a complete and incomplete form submission:
In the example above, the incomplete form submission will trigger the reminder email.
To delete the incomplete submission, go to the Forms module, find the submission and delete it:
Forms module - Submissions
If the guardian started a form, but did not enter lead details, this will also trigger a reminder email. However, the form submission won't show on the lead profile.
In this instance, go to the Forms module and view the submissions, then search for the guardian's email:
You should then delete the incomplete submission.