Here's what I've found so far: the Custom Fonts and the theme are both working properly. The only time the font doesn't load seem to be cases where there is a slow internet connection, and even then it only happens some of the time.
Based on feedback in this forum and my testing so far, it appears that the problem may be that you are loading way too much stuff on the home page and that is causing your site home page to have trouble loading on slow connections.
If you test simpler pages where you haven't added several images and videos (too many) at once, then you should see the font working normally there. Examples:
I have been unable to reproduce the problem with the home page at http://dekalaz.com/ on my computer from any connections I've tried so far. So it doesn't appear to be a problem happening all of the time, or for a wide range of users, even with a slower connection (it seems depends on how much content is being loaded at once). My apologies for the delay, but you should also keep in mind that most your viewers were probably seeing the correct font all along and I don't think a major problem is happening with the fonts.
There are a few things you can try from your side that may help the situation. One would be to use the more tag to limit content on the home page so you aren't loading too many things at once. If you load too many things in one HTTP request, it's likely to cause trouble anyway.
Another thing you could do would be to reduce the number of posts displayed per page using the "Blog pages show at most" option in the Settings > General page in your blog dashboard.
It's also possible that the CDN serving the fonts may have been having trouble temporarily in your area.
Regarding the refund, I think the theme looks really nice. Are you sure you want to remove it from your site and be refunded for the premium theme purchase? I think you should keep the theme.
I reviewed your account, and I found that you purchased upgrades separately instead of in a bundle. I can consolidate those for you and it will save $38 for all future renewals of those things. Would you like me to go ahead and make that change?