We don't seem to have the ability to change their password, which would be the easiest way to address the issue. There is no way to flag them as "inactive" either.
Deleting the account is an option, but lacks audit trail capability so I don't think that's appropriate either.
What is FreshDesk recommendation?
We understand that there isn't a direct way to handle this, for instance by marking the contact as "Inactive" so that they are not allowed to login anymore.
One way around this is to change the email address of the contact so that they are not able to access the system thereon.
Let us know if you think this would help, Keith.