Another third party is using my iPhone both iCloud and Apple ID
ID
iPhone 7, iOS 14
ID
iPhone 7, iOS 14
Yes
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.
Another third party is using my iPhone both iCloud and Apple ID