How do I stop someone from controlling my iPhone 16 and Apple Account through unauthorized WiFi connections?

I recently purchased an iPhone 16 and started immediately (as soon as I walked out of the store) started having issues! Apple account changed, passwords changed!! I returned to the store 3 different times to get help, but all that the store did, and my carrier did, was send me to an Apple Store for a complete reset and change phone numbers, hoping that this would solve the issue! NOT!! This has happened 11 times! I keep telling them that “someone” is controlling me! My device, my WiFi, Bluetooth, absolutely everything! I am not receiving vital information, about my bank account, (hacked twice! Purchasing Apple and google products) ruined my credit! Even hidd n notifications for an apartment and extremely good jobs! Local law enforcement nothing!!!! “It’s a grey area” meaning no set standards for enforcement! I am literally harassed, recorded, photos, videos, you name it!! My life is not my own!! My carrier recently decided to send a new phone! Set it up fresh and go from there! So we did! That was 2 days ago! And immediately!!!! Everything started happening again!! In 2 days my Apple ID has changed 3 times and passwords! I’m not going there! This person is absolutely not hiding what he’s doing!! It’s like a game!! A competition! Let’s see who can get what they want first! Settings changing right before my eyes!?? I have had enough!!! There are 3 “Managed WiFi” accounts on my phone! Through my carrier, but they won’t even address that issue!? And can’t get rid of them for nothing!!!!! Help!!! Am I just doomed?? This has all been going on since November 16, 2023! And this is not even the half of it!! Any advice!??? Oh by the way Mac Sequoia is all over my searches and settings! Not iPhone!

[Re-Titled by Moderator]