Are there managers out there that really have these conversations? I've never had one. How do you hold a coworker accountable when they are allowed to say "we do what we want here."?
Sorry to hear that. You may want to check out this video: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-GbVuJuBey6U.html But suffice to say, you've done enough to try and turn them around and maybe now it's just time to "invite them to be successful somewhere else."