Deleted post still there

Jan 12 at 10:27 AM
Edited Jan 12 at 11:25 AM
I have being nagged by a person commenting over and over again the same post. I wanted to unable comments on this post, but the Save button didn't work. So I changed it in the XML-file to False. Sometime later it was enabled again?

I then removed the post XML-file completely. It was still to be seen in the blog. The comments part also was still there. So I tried to make a comment. It didn't work. Error message : There was an error in the callback. See here: (http://foederer.info/post/a500-plus-rework-2)

Could anyone explain what is going on?
Thanks.

Edit: The Save-button not working is probably because I changed my admin name and password for the Blog. So I cannot change older posts.
Jan 12 at 11:26 AM
Purging the Trashcan was the solution.