Without knowing the complete details about you and your organization, we cannot provide proper guidance to you. Have you checked within your organization for similar cases where an individual took leave, submitted a resignation letter, and did not return for duty? What happened to their F&F Settlement? Did the management waive off the notice pay for the resigned staff?
Normally, some private companies adopt the practice of withholding a portion of an employee's salary to incentivize them to stay with the company. While this practice is incorrect, many individuals do not speak out against it due to the prevalent issue of unemployment.
Please let us know if you need further assistance or clarification on this matter.
Best regards