How to rid your hacker?

I contact Apple that my ID had been hack and they got my gmail password reset... however I can’t make them see that the sign in on my App Store has a yahoo email that is not mine. I can’t update any spyware to get rid of all the other hacking I have found. He is still in control of my banking app which says needs update. When I went to my security he is signed in on a iphone 10 an I have a iPhone 8.