"24. Lawful deductions.
(1). No deductions shall be made by an employer from the wages of an employee otherwise than in accordance with this Act.
(2) It shall be lawful for an employer to make the following deductions:
(a)deductions to the extent of any overpayment of wages made during the immediately preceding three months from the month in which deductions are to be made, by the employer to the employee by the employer¡¦s mistake;"
The above is the law in the Employment Act. You can of oouse discuss with those overpaid and sort out the matter with them.