Drilled holes too wide for drywall anchors- how to fix?
This is very complicated, and I'm hoping that you'll stick through all of the steps with me. ;)


Go to the store.
Get bigger anchors.
Return home and install bigger anchors.


(No, really, that's the answer. You can't patch the drywall and put anchors in; the most you could hope for would be re-drilling holes near to your anchor, but you really risk cracking the drywall if you do that. I'd just get bigger anchors.)