The project manager should first validate the reason for the nonpayment of overtime pay. If the complaint is valid, the project manager should add it as an issue in the issue log. The issue log is a project document where all the issues are recorded and tracked. It is used to document and monitor the status of all issues until they are resolved. References: PMBOK® Guide, 6th Edition, Section 4.3: Direct and Manage Project Work, and Section 11.6: Control Risks.