If you’re still having this issue then there is most likely and issue where the copy of the page lives in the databases, but isn’t showing on the site. Usually a quick search through PHPMyAdmin helps with that.

I couldn’t find anything with the support permalink in the drafts or trash so after going into the database, I discovered support.png was taking up the support permalink so I deleted the image and reuploaded with a different name. Convinced that I had solved the problem, I attempted to change the support-2 permalink by resetting it using your advice but it again didn’t work. I changed support-2 to support manually in the database and now it all works well.