Firstly I think i is a bit funny that your supervisors have cut you off. I means they were in on it. Please read my post many academics have the impression of unlimited power because of their tenure. There are a lot of politics involved and they also take pleasure in making people look dumb just because they feel smarter. Just look around you there are so many foreign students not very bright that cannot type and get proper PhDs, it is honestly all about politics nothing to do with you.
If you want to save you ass:
1)Make an appeal saying that they have made scientific error in correcting your work and state a few reasons
2) Ask to have it re-assessed by people who are not related to your university and whose names will remain hidden to all you faculty
3) Make a formal complaint against the examiners for slander and discrimination
Try this it can only get better
Cheers
-A fellow discriminated PhD

My story is completely true if anyone can think of a better way to salvage this then please write your response.
I started a PhD in England and all was okay in the beginning. My supervisor also employed a PDRA an eastern European young married woman who later on I found out that he was having an affair with.
Part of my research was going to trips with him and she got jealous. A war upon me started. They accused me of bad behaviour 2-3 times formally. Finally in my 1st year confirmation report after my supervisor contacted my assessors they failed me twice with unreasonable comments like "she does not collaborate with peers" or "we do not see a clear goal in PhD. I cannot fill that gap in my CV I lost almost 2 years and I am devastated. They also maliciously said, "we do not recommend her for an MPhil as she may not develop the skill, even though I have a Masters from previous studies. I appeal and they threw that appeal in the rubbish, I honestly hate this country this is worse than the corruption in Greece.