Update: unable to get a CS response anywhere that assured me Id eventually be credited for the charging plate charge, I stared to consider cancelling the order. It helped my decision that the phone hadn't shipped by Friday. So much for the "pre-" in pre-order, huh?

So, I went to an ATT store where they had the 920s and cancelled my preorder while I waited in line. The store, tho busy, was friendly and helpful. They didn't know much about the free wireless charging plate, but it was on the signage there. So eventually they were able to figure out how to order me a free one (they weren't in stock in stores Friday.)

note to self: buy in store, buy in store, buy in store.

edit: Jamileh, thanks for your offer of help. I would have taken you up if my preorder hadnt failed to ship by Friday. appreciate it!