Harmony Endpoint products are generally meant to be installed on corporate owned and managed assets.
They are hardened against attempts to uninstall/disable without using the uninstaller, which requires a password that is set by the administrator.
For installation on non-corporate managed assets, we have standalone VPN clients that can be uninstalled by the user if necessary.
Whether your organization permits their usage is a separate question.
In any case, I suspect you have damaged your macOS installation by attempting to remove Harmony Endpoint without using the uninstaller.
It would probably take less time boot off recovery media, take a backup, and reinstall macOS.