Another third party is using my iPhone both iCloud and Apple ID
ID
iPhone 7, iOS 14
User profile for user:
Community User
Check this article: If you think your Apple ID has been compromised - Apple Support. You might also want to read up on this once you regain access to your account: Personal Safety User Guide - Apple Support. The first thing you should do is change your password. You can manage your Apple ID via appleid.apple.com.