The HR Manager,
__________ (Name of the Company)
Date: __/__/____ (Date)
Subject: Complaint for unpaid salary
With due respect, my name is __________ (Your Name) working in department __________ (mention your department) holding employee ID number __________ (ID number).
This letter is to bring to your notice that my salary is not paid and due for __________ (Months). I kindly request you to make the payment at the earliest. I would also like to state that this is not the first time I have not received my salary on time. It is requested to see through this matter.
I believe you would consider this as a genuine request and you will do the needful at the earliest.
__________ (Employee ID)
__________ (Contact number)