[Silent Bob]

I sincerely doubt that there were no mileage seats available to you anytime for the entire year. If you've been booking flights with miles for as long as you have then you know how this works, there is no bait and switch tactics here. This is why us frequent flyers book in advance because we know "mileage seats" get snatched up quick.

This is clearly “bait and switch” tactics”, where something is advertised at a certain price and, when the customer calls, is never available, but the identical product can be found at twice the price.

Again not bait and switch, you're not the only one this special is advertised to. If hundreds or maybe even thousands of frequent flyers are trying to grab that same special, it just means you're the low man on the totem.