You have to complete the Argument Clinic quest before you can be keyed to enter the Plane of Complaint.
Plane of Complaint sounds more akin to Sunrise Hills( iirc thats the GM zone)... Devs go there to practice slaying complaints or ignoring them.
Ah ok, thanks. I have been to CShome twice on 2 different toons on 2 different occasions! Both after leaving a raid.. no clue how.