This from the FAQ:
How come that I still see visitors from countries that I blocked in Statpress or other statistics software?
It’s true that you might see hits from countries that you have blocked in your statistics software. That is the way it works, certain plugins may be run before iQ Block Country is run so it may log visitors to pages. This however does not mean this plugin does not work, it just means somebody tried to access a certain page or pages and that that fact is logged.
If you are worried this plugin does not work you could try to block your own country and afterwards visit your frontend website and see if it actually works. Also if you have access to the logfiles of the webserver that hosts your website you can see that these visitors are actually denied with a HTTP error 403.