Polite message for my supervisors who do unfair things that would totally leads me to lose my study
If things are as you describe there is likely no help for you on this site. Ultimately, you need to make your supervisor(s) happy with your work. 

I can see elements of misfeasance (lack of doing the job properly) here, but we can't solve that. An email, even if polite, isn't going to solve your problems. 

If you believe that your advisor hasn't properly guided you and is now abandoning you, then you need to deal with that locally. Either by working out a better (closer) relationship with the advisor or making an appropriate complaint to local authorities. 

But even if you make a successful complaint, it won't get you any closer to a degree and might get you farther away. 

The question I would want to ask of the advisor is about what you need to do to earn the doctorate. If you can get a plan, a written plan, and it is reasonable, then just do that and move on. 

You attribute bad motives to both of your advisors. That may be true, but it may also be a problem. If the second advisor is just "devil's advocate" it can actually strengthen your work, as long as that is all it is. Saying that your advisor doesn't want a written record may be true, but if true is a serious allegation. If I were adjudicating your case, I would question that sort of statement. 

Look first for a path to completion. If that is impossible, then an MS/MA may be all you can reasonably achieve in this situation. If it allows you to go on afterwards it may be good enough, though clearly not ideal. But find out, if you can, what it would take to make the advisors happy. Make sure it is clear and in writing.