How can I set my device up when I been hacked, they have used my number to add me into their family watch plan like I’m one of their kids they keep breaking in my bank account analistic show all kind of weirdo stuff

You can also add 2 Factor Authentication to your account for more security. If the attempts continue, you might want to consider a name change.

Link to contact Apple Support in the article.

Apple ID has been compromised.      *

Personal Safety User Guide

Security and your Apple ID.   *

Checklist: If you want to see if anyone else has access to your device or accounts  *

 Apple ID Password Change.  -

ASC YouTube for How to reset your Apple ID password

You can change your Apple ID email address on your current Apple ID so you retain access to your data and prior purchases. Note the restrictions in the article.

Apple ID Name Change.  * 

Make sure you turn off Find My Phone before signing out of the old ID. Once signed out and Find My Phone is off, then sign in with the new ID, then turn Find My Phone back on.

 What to do after you change your Apple ID or password - Apple Support  *  I suggest doing this before you change your Apple ID or password.

Apple ID -Two-factor authentication   *

Two Factor Authentification availability.   *

2 Factor Authentication - How to generate a recovery key.  *

Apple ID - Using app-specific passwords.   *

Apple ID - Two Step Verifications FAQ    *

They have access to you Apple ID and a trusted device. Try changing your Apple ID as I posted above.