Confusing premium add-on

I bought the premium add-on in order to automatically remove ALL messages and comments outside of my own country. Sadly, the country spam filters only seem to MARK a message as spam. However, almost all foreign countries were being marked as spam BEFORE the add-on was activated, thereby making this add-in totally pointless to me. It hasn’t saved time like I thought, as I still have to go through every spam message to see if it is spam or not!