this has never happened to me but even if it does u should check to see u are in the right role to start with before accepting the que.
Not be be argumentative, but I disagree with this statement. You shouldn't have to check -- the Group Finder should not make that mistake. I have been assigned the wrong role a couple times by the Group Finder, so I know why you suggest that. But Bioware should make it work correctly so people don't have to back out at the last second and get a queue penalty as a result.