Dear Melziz,
Following is the extract from a site referring to Phillipines labour laws about the resignation etc. (with or without prior notice) :
"What is resignation anyway? As held in the case of Intertrod Maritime, Inc. v. NLRC, [1991], resignation is a voluntary act of the employee which is beyond the control of the employer. Once accepted by the employer, the employee loses his right to the job. The Labor Code also recognizes resignation in Article 285 (a) which states:
“An employee may terminate without just cause the employee-employer relationship by serving a written notice on the employer at least one month in advance. The employer upon whom no such notice was served may hold the employee liable for damages.”
Similarly, when an employee has submitted a letter of resignation due to circumstances beyond his control, his dismissal was still deemed as constructive and therefore, illegal. This is due to the fact that the Supreme Court has held that constructive dismissal is “an involuntary resignation resorted to when continued employment is rendered impossible, unreasonable or unlikely; when there is a demotion in rank and/or a diminution in pay; or when a clear discrimination, insensibility or disdain by an employer becomes unbearable to the employee.” (Escobin v. NLRC, GR No. 118159, April 15, 1998)
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ALSO READ A JUDGMENT OF S.C. OF THE PHILLIPINES REG.ABANDONEMENT OF EMPLOYMENT AND SUBSEQUENT TERMINATION ETC. IN THIS LINK>
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From the postings I have no clue whether the mandatory one month prior notice intimating your 'intention' of resignation was served or not. And whether or not you resumed duty subsequent to these developments. The worst that could happen, in this case is, in the event that abstaining from resuming duty and attending the inquiry might result in ex-parte conclusion of "dismissal without any benefits" which probably, under due legal advice could be contested in your jurisdictional courts. Of course they may also sue for compensation or so if found guilty of some crime for losses sustained by your employer. This is my presumption