(1) Nothing in this Division shall affect any right to vacation with pay acquired by any employee under any collective agreement, employment contract or other agreement existing before the commencement of this Act where such right to vacation with pay is equivalent to or more than the amount of leave with pay granted under this Division.
(2) Where an employee or a group of employees at a workplace, before the commencement of this Act, was entitled to a period of vacation leave with pay greater than that prescribed under section 97 whether by collective agreement or custom, his or her employer shall not decrease the period of vacation leave due to that employee or at the workplace.