Resignation with immediate effect
Where an employee resigns from the employ of his employer and does so voluntarily, the employer may not discipline that employee after the resignation has taken effect. That is because, one the resignation has taken effect, the employee is no longer an employee of that employer does not have jurisdiction over the employee anymore.
In summary, the principle to discern from the above is that an employer has no authority or the power to discipline an employee who resigns from his or her employment once the resignation takes effect. In other words where the resignation is with immediate effect, the employer loses the right to discipline the employee, also with immediate effect.