Locked out of Facebook?

[shutuppauface]

Just knowing someone does not require them to accept your Friend request, and if they are Friends of Friends, they may have no idea who you are.
Three hundred requests in a few days is a huge red flag, as would be five people turning you down-- or clicking on the Do You Know So-and-So Outside of Facebook? button when they see your request-- a hundred of them is Defcon Five.
You can either send them the ID they require or start another FB page using a different email address, and pace yourself, nobody knows 300 people IRL that are actual friends to connect with in just a few days.