I don't know if all you noticed, but the fresh accounts that register on Bitcointalk to file a complaint don't even read advice or arguments. There is an immediate attack and insults on everyone.
If he has enough evidence then what is the problem with creating a brand new account and complaining? It is possible that the user did not know about bitcointalk for so long now, so he created a new account and posted in the hope of finding a solution to the problem.
There are lots of shiller accounts who share positive things about a particular company without providing any kind of proof which is dangerous for inexperienced new people.