Accidentally overwrote the index.html can I revert because reuploading isn't working

I accidentally overwrote the index.html; when I re-uploaded the correct index page, the front end is still displaying the page I uploaded mistakenly. When I view the index.html page from the S3 it appears correctly but when I go to it from the subdomain I created, it still goes to the mistake page.

How do I get this back?