Someone Opened Att Accounts In My And My Wife's Names And Att's Fraud Dept. Said They Were Legit, Now What?

I got some emails in October about my "new ATT wireless account" but I thought they were elaborate phishing emails. I forwarded them to their fraud department and never heard back. Then my wife gets a paper bill about 2 weeks ago. She confirms it's real, I call and confirm my account is also real and start a fraud claim. We both submitted police reports, FTC reports for stolen identity, froze credit, ect which ATT makes you do for a fraud claim.

ATT responds yesterday to my wife's claim: that it was real and she opened the account (which has a $1300 iphone on it) and she's responsible. What recourse do we have now? I haven't heard back about my claim yet but I'm not optimistic. She requested an escalation and appeal, but I'm also not super optimistic about that.