Same here, but I don't think they did anything wrong. They told me when I was placing the order what I would get. You are buying military SURPLUS, they can't order more from the factory. They ran out of holsters and short of mags, simple as that.
I wasn't actually saying SOG most certainly baited and switched, but that it's possible. If you were told before you ordered that you were getting a gun and a mag and you got a gun with a single mag, then that's all well and good. But unless I am misinterpreting what I'm reading, there are those who ordered a gun advertised as coming with two mags, only to be told after placing their order, that the gun would come with only one.
Sure you have the opportunity to back out and say "Screw that, if it doesn't come with 2 mags, I don't want it!" but many if not most people will say, "Well, it's almost what I wanted, so ok, I guess I'll take it anyways." just to avoid the disappointment of not getting anything at all.
Now if SOG just ran out of spare mags and didn't see that coming, and for a brief period said to those who placed orders, "Sorry guys, looks like we're out of spare mags so the gun you're getting will come with just one" but then immediately changed the ad accordingly then there's really nothing wrong with that I suppose. It's quite possible that you run out of something before the ad can be changed, especially if you're selling a large variety of things. If, however,
for several months they've been saying "sorry guys, we're out spare mags" without changing the ad, then it seems like they were doing the bait and switch routine. It depends on the timing.