If you do get back in don't forget to go to Settings > Your Facebook Data and get a copy of all your data out in case this happens again. While you're at it lo

If you do get back in don't forget to go to Settings > Your Facebook Data and get a copy of all your data out in case this happens again. While you're at it look at your other services such as your Google account and save your data out of them using their "Takeout" service as well. Facebook is not the only service that locks accounts with no appeal, human contact or legitimate reasons.