You failed to mention what kind of Job you are in now. I am certain that your agency from Ph is well aware of the changes that will happen in your contract, but that is not their concern. Deploying you with "proper" documents is their focus, thus not informing you of the scenario. POEA (?) has set minimum salary for every job category before they can approve the agency's application for one applicant to proceed further (PDOS, OWWA, Medical, NBI blah blah Blah). OK? In this regard, agencies are the one's asking the overseas employers to issue a dummy contract mentioning false job category (category supplied by the agency too), into which they will refer as "internal agreement" and cannot be used by the applicant against employer/agency. Now, in my opinion, the least you can do is to gather all your documents together, at least a copy of everything if you cannot keep the originals like passport, which i am assuming your Employer is already keeping. Secondly, make up your mind, be careful on on the advices you are hearing. And pray, because once you started any legal action on your situation, there is no more turning back. Be prepared for the worst.