A formal complaint is a serious and official expression of dissatisfaction or disagreement about something. It is a way to express a problem or concern in an organized and official manner. Full definition
Assist individuals filing formal complaints with public bodies, such as privacy complaints and police complaints. (bccla.org)
Patients can make formal complaints to the health professional's college about a practitioner's conduct. (medmalpractice.ca)
Domestic violence is a legal ground for divorce, but many women are reluctant to file formal complaints against such abuse. (globaleducationmagazine.com)