What to do when IPhone 14 Pro Max has been cloned?

My ex is really good on phones and computers. She knows about hacking. She told me how she cloned someone’s Iphone in the past. Said she had a key stroke logger on it. I’m 99.9% sure she cloned mine as well.I got an IPhone 14 Pro Max. My battery drains super fast. Sometimes things will move on my screen by themselves like someone else is controlling it. Pictures have gotten erased. My videos and pictures on my fb business have disappeared. I’ve changed my back up account for all my accounts. I’ve changed the password for all my accounts. Once, the phone is cloned can you combat it? She’s even sent me screen shots out of my account. A lot of apps won’t work right now. Like I can’t save audio clips on fb, can’t save videos on YouTube, apps continuously freeze up and they’ve never done it before and all this started happening the day she left. I know she downloaded the data out of my accounts. How is a phone cloned in the first place? And once cloned what can be done to stop it? I’ve even been having issues getting calls and text. Sometimes someone can call, but can’t text and vice versus. Ppl have told me on fb they tried calling and it said my number was not a working number please try again later. I even went and used the persons phone to call my phone hear it for myself. She’s got one of them hacking tools that you can do all kinds of stuff with it.she don’t know but I seen it.