Who do you contact if you want to report a united nations employee for mistreatment?

A UN employee hired a family memebr of mine to work as a housekeeper and treated her like a slave, not feeding her much, little to no pay, and kept her in the basement.|||Well this is where you would complain; http://www.un.org/Depts/ptd/complaints.h鈥?/a> I hope this helps, you can not treat people like this and get away with it.