沒有必要去考慮其他。而且如果這次他們成功,將來後患無窮。
把他們的東西12345寫下來,make a list, 寫上您的意見及處理方案(口氣要堅決,and professional), cc給boss.
有一點我很想強調,如果那個工作由您負責,您有權處理一切在您範圍內的事。沒有必要事事請示,因為your job is supposed to slove problems within your definition of the position. 如果事事請示,your boss would think you are incompetent in decision making and problem solving.
And get the idea of revenge out of the window. Confrontation helps build your authority.