That sucks. If they think you're being stubborn, tell them that you'll truly act stubborn for a day, and let them compare. I find that it may help give them a kick in the pants to get them back to reality. If that doesn't work, give 'em a long speech on how you're feeling, and how you feel they are treating you, what with all this cheating business.
And if THAT doesn't work, I'm all out of ideas. I, personally, would isolate myself in my own room for a day or so, with little contact to the culpriats.
_________________
I was sad when I found that she left
But then I found
That I could speak to her,
In a way
And sadness turned to comfort
We all go there