I think a swap is totally different from purchasing something from someone in good faith and having it switched to something else. Especially after waiting so long for them. A swap has rules too, though. But not the same as a buyer/seller situation.
I don't know if this is the right place to rant about this, but I am fed up with paying for something and not getting what I paid for! This happens a lot with hatching eggs, I buy them lots of sources, and too often the sellers are adding extras I don't want and not marking which they are, or...