Employment Suspension due to tardiness

Hi, i was informed just now that i am suspended for a day because of tardiness. i was advised by my Senior Manager after i advised her that i cant make it today for i was sick.i was also advised that she made the effectivity of my suspension to July 2, 2012 (a holiday here in Pasig City) so i could not receive any holiday pay. My absences started the following dates: June 25- 27, 2012 (sick and filed an SL with medical certificate attached the day after (advised to rest on the 27th)); July 3 and 4, 2012 (with medical cert but no SL left) and today July 9, 2012. I have been sick lately but never fail to advised them of my condition. But since i haven’t received any formal verbal/ written warning from her or from the HR/ management. May i validate if they have the right to suspend me given the effectivity date and the reason. Hope to receive your validation the soonest. Thank you in advance.

it is wrong to apply the suspension retroactively on a holiday. assuming you can prove your claims, then you can file a case of illegal suspension at nlrc