Hi there. As of March 2025, once an account is linked to a profile it's permanent and cannot be unlinked (except Twitch). Regardless of that policy update, you would be required to authenticate the login to that account in order to disable Cross Save. [url=https://help.bungie.net/hc/en-us/articles/360049498031-Destiny-2-Cross-Save-Guide]Under no circumstances does Bungie forcefully remove or unlink accounts[/url]. We highly recommend you change the passwords and enable 2FA on all of your accounts to prevent further access. Your best option is to contact Playstation to see if there's anything they can do about that person's account. Please note they cannot, however, give you access to that person's account or do anything to remove it from your Cross Save. For more info please see [url=https://help.bungie.net/hc/en-us/articles/35597981889300-Notice-Bungie-net-Account-Unlinking-Update-on-March-25-2025]this page[/url].