I do apologise on behalf of TSM, this stuff doesn't usually happen on here (if it did I wouldn't come on here myself). In regards to the KTM if they've stood by it and covered it under warranty then I suppose you can't really complain, everone makes the odd mistake so one bad gearbox out of all the bikes sold is pretty good going.
As I say TSM isn't usually like this so please stick around long enough to realize that.