Okay I was getting REALLY pissed off by cafe account griefing my server was being a victim of.
So I've decided to open a STEAM support ticket with Valve last week and complained about the abuse of cafe account.
They took the matter seriously, I've just received an update from steam. See attached image.
SEE YOU IN HELL OATZ.
(I know it's Oatz because the SteamIDS I've submitted to steam are the one from when he was crashing servers.)
Bottom line is: If you ever get repeated abuse from people using cafe account, create a Steam support ticket and submit IP/SteamID/Date/Time.
cafe.jpg