Of all my times playing in a CC, I never heard the attendant do something like this.

I paid for 12 hours package frequently when I am still playing WoW for raiding and heroics. In between I would take like 1 hour go supper with friends and then come back continue again. There were times that I even go back home, take a bath and then go back to continue again.

They simply cannot shut the PC even if no one is there because the money has already being paid. Even if I play for only 1 hour with my 12 hours package they still have no rights to shut down my PC because the price for the time has already being paid.