They didn't remove hd from you. The smart pack does not have an hd line item. Because you pay extra for it, if the channels are avail in hd, you get them. When you removed the heartland, you removed the hd channels, and added on the at250. Which is SD. To get the hd line item to achieve those channels, without sub'ing to the heartland package, you do need the migration. Now, as for locals, if they are avail on both satellites, in hd, then you will continue to get them one way or the other. But dish is going to straighten it out before you no longer get the hd locals because you are on WA, whenever that change may occur.
Do not confuse the fact that you paid extra for the heartland pack with being subscribed to hd. You were not subscribed to hd while you had the smart pack. They are two completely seperate things, 2 completely seperate line items, and two very different bill amounts.