Why is the storage space in my Zoho Forms account not freed up even after deleting multiple entries?

Why is the storage space in my Zoho Forms account not freed up even after deleting multiple entries?

The deleted entries must have been trashed and not permanently deleted. To free up the storage space, you will have to permanently delete the entries.
To do so, 
  1. Go to the All Entries section of the form.
  2. Select the Trashed Entries option from the Filter in the top-right corner.
  3. Select the entries that you wish to delete permanently from the list of Trashed Entries and click Delete. 
    Trashed Entries
    Delete Entries
Notes
Note: The trashed entries would automatically be deleted after 5 days.
Refer to this help link for the steps to permanently delete the trashed entries from your Zoho Forms account to free up the storage immediately.
Refer to this link to view the storage consumed for each form under your account and this link for the steps to view your account usage.