No mate, that's not how it works. Teeteringhead is spot on......
This isn't a performance related Bonus....this is a "Did they pitch up for work" bonus.
I thought the bonus was related to satisfactory performance at work - i.e. meeting objectives set by presumably you as their line manager?
Does this mean that the "incompetent, inefficient, wasteful" CS working for you met the objectives you set them to get the bonus?