This sounds like you need to work on the plumbing. You either did not upload the fonts to the correct directory, or you did not link the fonts properly in the CSS. If you've confirmed that all this is correct and you still have a problem, take a look at your .htaccess file and see if requests are getting intercepted.
If you aren't sure how to check your plumbing, view the video below. We'll walk you through how you can solve your webfont CSS issue easily.