Nice that you remember there was an issue with an expansion pack, but pretty sad you can't remember what it was for.
Makes me wonder if you just read about it or something, rather than actually experiencing the situation, so you are having a knee jerk reaction to something read.
Anyways...
It was Asheron's Call 2 that this occurred with, so everyone can know. The game was fading, so they released an expansion with a new race and new content, it didn't sell well enough, so within a few months of release (2 or 3) of the expansion they canceled the game.
And did not offer a refund for the expansion.
So yeah, while it was a screwing over of their customers at the time, you seem pretty incensed for someone who it didn't happen, or it doesn't seem to have happened to by your post. If it did, then I apologize.