I'm not sure what your problem here is right now - is that that you reported that person and nothing happend, so you've reported them again and again and are now annoyed that you're just getting told every time that they cant tell you anything?
Or is it that even after you closed the whole conversation the message still appears?

If its the later: file a bug-report, afaik they're aware that this problem exists, but it cant hurt to bring it to their attention again.