Ok, I know I'm late to this but I'm giving my advice all the same. Orion, first you NEED to calm down, if not already! I have lost drafts this way before and blowing off doesn't help the situation. I know it sucks and is extremely annoying and you want to either give up or take it out, but that front is a scary one to show others.
Second, send a note to Wattpad. Let them know what had happened. At the very least they will be aware of the situation and will try to prevent this from happening again. From personal experience, I'm afraid there is no guarantee the drafts will come back. A few years ago my deleted draft turned up in an very unusual way, but I have not seen anyone else get theirs back the same way.
I'm guessing your chapters were deleted so that no part of it exists at all, but if the chapter itself is present and not the majority of what's written, see how far is saved in the revisions. It does save automatically and save it to revisions. I have had a majority of chapters deleted and got most of them back through the revision history.
As I said, there is no guarantee to getting them back. It sucks but all you can do as of now is keep writing. However the best advice I can give you now is to save your drafts and chapters to apps outside of Wattpad. The advice most veterans give to other writers is that sadly Wattpad just can't be trusted to keep drafts safe from bugs and that the drafts should be backed in apps like Evernote, Google Docs, and Words.
I know it's absolutely not fun starting over from scratch after being ahead, and I'm so sorry it happened, but really the only true advice I can give is how to prevent it from happening again. I wish there was more I could do to help ;(