COMPLAINT

grievance /ˈɡriːvəns/ (n):

[grievance: to air/ aim to deal with/ nurse + grievance]

#1. ​something that you think is unfair and that you complain or protest about; a feeling that you have been badly treated.

Parents were invited to air their grievances (= express them) at the meeting.

These interviews aim to deal with individual grievances.

grievance against somebody: He had been nursing a grievance against his boss for months.

Does the company have a formal grievance procedure (= a way of dealing with your complaints at work)?