Is it okay for employers to impose salary deduction because I did not informed our office mate that i will be absent but informed him?

My employer went outside philippines with his family for a vacation. One saturday, I can't get up and was not feeling very well so i decided to text him that i can't go to work because i was sick. it was a saturday and mostly i'm the only one who goes to office.

I texted him before office hours and he claimed to have received it our 10:30am philippine time. He was so mad at me for not informing my officemate that I can't go to work. I was not able to because i went back to sleep after texting him.

What he did was that he deducted 500 pesos because i did not inform my officemate and an additional deduction of 150pesos because he blamed me for his international text message charges to me. Dahil daw sa akin he was charged with international text message sa pagtext nya sa akin from UK.

Please help if i can still claim this kind of forced deduction. This is not the only time he did this to me. Thank you!

Check your contract, if there is no written agreement regarding deduction due to other reasona then file a case to HR first if they too can't do anything then go ask DOLE