According to the owners manual, you have to reset the infotainment system to its factory settings to remove saved phone profile/data. Go to MENU > Settings > Restore factory settings.
User profiles
An individual user profile is automatically created for each coupled mobile device. Data from this mobile device, e.g. contact data or settings, is stored in the user profile. A maximum of ten user profiles may be saved in the Infotainment system simultaneously.
To delete the stored data completely, reset the Infotainment system to the factory settings.
