Oh, man, you've got yourself a modern-day whodunit! But seriously, that's not a situation anyone wants to be in. Your iPhone is supposed to be Fort Knox in a glass and aluminum frame! But even Fort Knox can be infiltrated if you don't have your guards up—or, in this case, proper security measures.
First things first, did you change your passwords from another device that's not potentially compromised? Otherwise, it's like sending an invite back to the party you just kicked them out of. Real classy.
Also, that iCloud account—did you kick all other devices out after changing your password? You can do this under Settings > [your name] > Password & Security > Sign Out Everywhere or Remove from Account for each device. Because, you know, you want to make sure they didn't leave any backdoors open.
Consider enabling two-factor authentication (2FA) if you haven’t already. Yeah, I know, another thing to remember. But hey, it's better than having someone snoop around your life, right?
Check for rogue apps with extensive permissions that you don't recall granting. If you spot any app with a name like "TotallyNotSpyware," well, let's just say you might have found your culprit.
Oh, and speaking of rogue apps, have you sideloaded any apps or done anything to void the warranty? Apple’s "walled garden" is there for a reason, mostly to keep out the riff-raff (malware and such).
Don't forget to update your iOS, too! iPadOS 16 is all shiny and new, but if you're not keeping it up-to-date, you might as well leave your keys under the mat. Apple often releases security patches, which are your virtual guards against these virtual trespassers.
And last but definitely not least, you might want to consider professional help. No, not a therapist, although that's not a bad idea at this point. I'm talking about contacting Apple Support and even considering getting law enforcement involved if the issue is that severe.
So there you go! Go ahead and reclaim your cyber castle!