The fact that you're seeing the Complex Script Font notation suggests that
you may be getting closer to Farsi. I had lost track of what you were trying
to do until I backtracked through the thread (had forgotten that English is
not what you want). You need to disable automatic language detection and set
the language of the entire document (and the header/footer specifically) as
Farsi. If your page numbers are in a frame, they may need to be selected
explicitly. If you can access the Page Number style and change its language,
that would be helpful. See
http://www.shaunakelly.com/word/styles/ModifyAStyle.html for tips on
accessing styles that are not displayed in the Styles and Formatting task
pane.