forced resignation to unknown reason and giving me a hard time for COE

Sir/madam

good day po I just googled it about for having a hard time getting a COE and about some problems in their employers. I'm gonna share my story and I would like to beg some opinions and reactions for readers and lawyers.

I was a Supervisor and Housekeeping trainer at one of the successful hostels today in Phil. andto aq sa company na to since started to provide standards and ideas to run a lodging operation. it means the owners and I helped each other to make it stable and operational ( owners-investment, and me-provides knowledge, standards, manpower, etc.) and run very smoothly for 1 year and 6months already. and dahl dyan ngkaron agd kme ng branch sa boracay..
and dto sa boracay branch naiayos q dn at nagawang stable ang operation and I worked for the hostel for almost 12-16hours a day everyday and because i am a supervisor, wla akong nkukuhang overtime pay. and dto din ngkaron aq ng mga issue sa owners which is "non-sense" reasonings like kpag npagkakamalan aqng owner ng mga tourists na guests namin or even locals, dun nagagalit na cla which is hnd q alm na npagkakamalan na pla aq na gnun maybe because nakkta aq ng mga guests q from morning till night (and sometimes midnight too).
this is my total duties everday ;
8am-10am : monitoring of the building and checking overall reports from yesterday
10am-2pm : housekeeping coz we are lacked in staffs (mtgal q na nrerequest un pero hnd nla inaaprove kaht ilan ult q na nrereport sa kanla) checking over all rooms.
2pm-3pm : front office/reception (papalitan q un female staff from morning sa front desk) checking booking system for incoming, staying guest, etc..
3pm-4pm : ayan break ko na..
5pm-onwards (sometimes 9-11pm ang out depends sa situation sa hostel) : front office/reception, checking and fixing booking system, control, monitoring, updating income and expenses of the operation, daily night events, and sending daily reports to owners.

yan lng nman po un duties q everyday. But I love my job thats why I never ever tell to anyone or to owners that I want to give up in my job. and never aq nagpakita ng kahinaan sa staffs q and owners. and yeah I know that it seems I am overworking myself to the hostel coz my reason is I care too much sa hostel and I want to make the 5 storey building hostel in boracay to become stable operation so I can go back to manila as soon as I can dahl un ang usapan namin ng mga owners. and i never say NO to them.

and dumating un tym Feb 13, 2014 yan un date na bngyan aq ng owners ng isang inaakala qng bakasyon pabalik to manila for a week and I am not expecting it na un na pla un huling arw q sa work.

that night (thinking also about my flight coz its already late) the 2 owners talked me about it and, they giving me also a memo to explain that the case was happened about 2 weeks already coz one of the guest paying 200 pesos for sleeping in the couch instead of 300 pesos and saying that I was the one who approved it but it was just a lie coz it never happen. but still, the guest paid 300. and that time too they accusing me for keeping a tip from the guests instead of to centralized it. (also a lie, take note they are accusing me without evidence and they just relied to chismax from the staffs dahl lagi dw aqng nanlilibre sa mga staffs) also, they accusing me

sorry naputol.. hndi po buo un tnype q..

they are accusing me na "hindi q dw ngagampanan ang mga trabaho q" (check my duties above, hnd q pa pla ngagampanan ang trabaho q nyan) and I answered them, "maam, we habe cctv cameras all over in our building, feel free to check where am I everyday. and they skip the issue. also they said that they are kicking me out coz of my "overworking in the hostel" ang gulo db? cnab nla na d q dw ngagampanan un trabaho q and after that dahl dw overwork aq. and madami pa po reason yan mga readers.

after a week, un ung time na pabalik na q ng boracay dahl nun arw na un nun gnigisa nla aq sa d q maintndhan na bagay, and this is the surprisingly moment. dun na nla pinilit iabot ang resignation letter q na d q nman gnawa. lawyers, I want to ask if it is legal too? na ang mga owners or managers o sino pang higher position yan ang mgbbgay ng "resignation letter" mo at pirmahan ito? and this time inipit na q ng mga owners na if d q tatangapin ang forced resignation, wla akong mtatangap na kaht mgkano or even COE.. which is it is the one of the most important to me coz it was my first shot to have a COE as a supervisor and I had just imagined that time na mas mpupunta sa wla un pnaghrapan q. thats why it ended up to sign the forced resignation that they gave me.

and now its already past 5months, im having a hard time getting an authenticated COE. coz they gave me only a piece of gray paper (un gray paper na newspaper ata un) written in black print above "certificate of employment" blah blah blah.. without sign and seal..

and now an hour ago, I requested again for COE for the 16th time, and she replied "gawa ka na lng ng COE mo at pipirmahan q". I replied, "maam, ako po ang gagawa?" and she replied again, "oo dahl busy ako! dalhin mo na lng sa makati at pipirmahan ko" what should I do about it? pls help and give me some opinion.. thank you and have a nice day readers and lawyers.

I hope na may sumagot sna.. any opinions or advice lng.

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