Now the three ebooks, and the Christmas special one, seem to be available at Kobo. However I can't buy the second one since it's already in my library and I won't buy the third one since I actually already have it.
I'll wait for the Live Assistance to open so I can see if my library can be updated (me having the third one) or I'll get a refund as they offered me and I'll buy the second and third ebooks right away.
But maybe the issue isn't sorted yet and I'm getting of myself here.
I'll keep you posted
Edit: still not fixed. I'm checking that with previews.