Crappy Clerks

Two ladies incorrectly invoice a client and cost the company a whole lot of money. Also the company computer is not to be used to send personal emails which they do not seem to understand is an issue. After a warning last time a more severe punishment is in order. I tell them that they are to be fired but they beg to keep their jobs at any cost. I explain the only way to keep your job is to be disciplined. They agree and a punishment ensues.