It sucks that it happened to you, but Samsung turning back on its partners is a known tactic in SK. The sad part is Samsung is probably not the worst of the bunch in that country.
My father was a "Samsung Man". That's actually a term that all Koreans know, and it used to be a badge of honor, especially in the 70s and 80s.
Samsung used to take care of its employees well, paying great bonus, and giving its strong performers a piece of (or whole) sub-contracting business as retirement gift.
Those were the old days.
Now, all you hear are their brutal and sleazy business dealings a real shame considering they are 100x wealthier than when they were at the most generous.