Company wants me to pay 6 figures after I resigned as a probationary

Hi everyone. I am currently in a probationary status in my company and malapit na matapos yung contract ko. Ayaw ko tumuloy sa pag papa regular so what I did was talk with my superior regarding my decision and then passed my resignation letter stating that I would end my work on the day my contract expires. After that one, the HR accepted my letter endorsed from my head but then HR told me na I need to pay for liquidated damage amounting to 6 figures because of "Breach of Contract" dahil daw nag resign ako kasi may nakalagay dun sa probationary contract ko number of years that I should not be separated from the company for that number of years. But from what I understand dun, nakalagay is " official employee" and sa previous clauses my status is " probationary status" tapos right now pinapapirma nila ako promissory note regarding sa settlement for the liquidated damage.

What should I do? Plan ko na di na kasi pumasok nalang and ibalik muna lahat ng liabilities like laptop and company phone before hindi na pumasok.