As far as I know, they didn't call the IRS -- the info was not a 1:1 match, so they said there's nothing they could do, including going into their own app and fixing, or allowing me to do so. I could've deleted the account, but they said they'd release the car and I'd lose the deposit because it would be canceling the order. And they wouldn't work with me to avoid that. So after a couple days of them supposedly looking into I and giving me their final decision, I canceled, but don't want to try again unless I know I can edit my middle name. If I can't, that's another $250. I saw this happened to a couple users on Reddit, so my case can't be unique.
I understand the advantages to buying a car this way ... when it works. This is when I miss human interaction because I guarantee I would've come home in a car if I was at a traditional dealer.