iPhone 13 hacked no notifications saying my password compromised

How do I get my iPhone 13 secure ? I’ve done a factory reset and also had to upgrade my iPhone 7 to 13 because the battery wasn’t charging.

I went to Apple Genius and the person I saw said I’ve done all I can to protect my device and he wasn’t able to get my iPhone secure.

when I’m on my cellular data the hackers can enter my phone and open app, change the music I’m listening to. I shut my data off to stop them using my apps. I’ve never shared my password, clicked on any link I don’t know. My iPhone is completely up to date w iOS.

I deleted the “WhatsApp “ app because I was sending a message to my friend and the hacker started typing in my message. He was able to type while I was typing. Was super creepy !!

I have limited apps on my iPhone.

I want to use my iPhone like I do in my place but each time I leave my place the hackers know immediately and start playing with my playlist in I music.

I’ve not had any notification that my password was compromised. The one notice I did get was when I had my Apple ID password changed and I reset my iPhone. I tried to play music but was unable to. This noice showed up.

I deleted the imusic app and reinstalled it then reset my iPhone.

can anyone help me?!?