It's a Hail Mary, but you child try the AA RTW desk. They might be able to help. Amazing agents. Explain the issue ... they might be able to take over the ticket or give you ideas on how to direct BA ATL fix it.
Call for free on Skype to 1-800-247-3247.
PS, ask for Tariq, Melissa or Rebecca. They are most senior as AA just hired a few new agents who aren't as adept yet at figuring out problems.