There is a different team within Apple that can help with this. I think it's called Consumer Relations or some such thing. They're hard to connect with, but onc

There is a different team within Apple that can help with this. I think it's called Consumer Relations or some such thing. They're hard to connect with, but once you do they can work magic. Don't give up on this! If they've broken your computer, especially if you can prove this via the usage history on the device, then you should be taken care of. For example, if you can show you were actively using the computer the day of the appointment, well after the time that you created the appointment, that would be evidence that you didn't make a fake battery appointment in order to defraud them. I'm surprised they didn't turn it on or anything at dropoff. I feel like they usually check stuff or disable Find My when I drop devices off. But maybe for battery replacements it isn't necessary?