How to hide mobicontrol application from Android?
I recommend filing a ticket with technical support. Feature Control policy should be the way to disable the removal of the MobiControl agent from the device. If that is not stopping the uninstall then either its a bug or a configuration issue.
While you can have multiple profiles targeted to your problematic devices, check and make sure that there is only ONE profile with feature-control configuration payload. Also make sure the status of such profile and its feature-control payload are both "installed".