I had gotten a call from the Concierge.Were you notified to bring in your car for the battery change or did you request it?
Then with the Concierge on the phone I drove to the dealer who told me they still couldn't order the battery on the parts website. So I passed that on to a contact who is a regional Chevy service manager. He called me back to say there had been a problem with website that he hadn't been aware of. The next day Daniel from the dealer called me very happily to say that he could get a battery. I feel I played my small part in the whole drama.