Great news guy i just got a E-Mail from game stop with the right code for the Classic pack, not sure if they will just send out new codes to all digital sales are not. You can shoot them an E-Mail if you don't.
Same here. I had sent in a ticket to the DD partner company and they responded that the correct code should now be emailed out by GameStop, sure enough I had the correct code in my Inbox.
As for demanding something from Bethesda over it, once you have your code, there's really nothing to complain about. Frustrating to have waiting not knowing but in the end we (I at least) end up with the Caravan and Classic Packs for the trouble.
I speak only to the PC problems, I'm bummed out for the console folks.

My 360 code worked first time no problems and my characters have the Classic Pack on both of my XBox's so no complaints there.