Not that I want to be in the position of defending Gree, but my understanding is that they are willing to fix this issue for all players. You just have to stay on them about it.
I have spent about a year in KA, as a free player for half that time. They're responses to my tickets have been consistent throughout. Sometimes consistently bad, and sometimes surprisingly responsive, but I certainly haven't seen a difference in customer support since I started spending money on this game.
Ben, I have been following this thread from the beginning, and I'm pretty sure we experienced the same problem. I did not get the 20% magic attack boost from the Spirit of the Chalice unit. The unit was in my inventory, but no bonus. And I got the same canned and ineffective responses to my tickets at first. But with the latest fix, when they remove and re-add the unit, the 20% boost appeared on my bonus list and did impact my stats. It's working now.