In that case, we must note the words "...in addition to the holiday pay...." (3) below. Employees who are paid by the day or by the hours should get 1 holiday pay plus 2 days' wages, which will come to 3 times. These categories of workers are different from monthly paid workers who are already paid for the public holiday in their monthly salary. So, for the monthly paid employees, they will get two days' pay (as understood by HR) instead of 3.
"60D(3) (a) Notwithstanding subsections (1), (1A) and (1B), any employee may be required by his employer to work on any paid holiday to which he is entitled under the said subsections and in such even he shall, in addition to the holiday pay he is entitled to for that day:"
(i) in the case of employee employed on a monthly, weekly, daily, hourly, or other similar rate of pay, be paid two days' wages at the ordinary rate of pay; or "
Should you be paid less than 3 times, you can consult the Labour Department and get the official views.