250+ Registrants' details for a webinar lost

I recently made changes to a webinar that we had scheduled. Soon after making the changes, i realised that all the details of the 250+ registrants was lost. Now the total registrations is showing as 0. The meeting ID and other things are same.

How can i get back the details of all those people so that i can re-register them ? Or how can i undo the changes made?
IMPORTANT - PLEASE HELP