My iPhone is compromised

My phone is compromised I’m in a legal custody battle and my ex hired a pi and we think he cloned my phone with an old sim of mine or he just keeps getting my Apple ID whenever i change it. I keep iCloud Drive off but some days it’s like an all day battle to switch settings and passwords that he’s changing. About once a week I find all theee screenshots and photos I took and some I didn’t take up in the cloud or Teri t to be sent right from my backups . I’ve seen trusted emails and numbers being changed. I had three new numbers two new phones and five Apple ID and password changes but he still keeps going. He’s taking pictures of my messages and they are reading my emailes. He sends me phishing emails Also. I don’t even trust calling the Apple support line bc they can’t prove who they are and everyone asks me different things like none of their protocol is the same

​[Re-Titled by Moderator]