The HR Manager
___________ (Name of the company)
Subject: Complaint about inappropriate behaviour.
With due respect, I am ___________(name) and I am an employee of your organization at _____________ (designation) having employee ID _________(mention ID) and I have been working in your esteemed organization from ____________(duration) months/years.
I am writing this letter to inform you about the inappropriate behavior of Mr./Mrs. ___________________(name of the manager/team leader), who is the project/team manager/supervisor of ________________(department) department. I would like to make a formal complaint against _____________ (name of the manager). Being the manager of the department, he/she should behave well with all the employees but his/her behavior is biased towards some employees. ___________ (mention your points in detail).
Therefore, I am writing this letter on behalf of all my fellow employees. His/her behavior is consistently ____ (rude/negative/other), which is morally not good at all.
I would request you to kindly look into the matter and take the action appropriately. I hope you will definitely take the required actions against _____________ (name).