When I view my site on phone it is fine, but on PC it is displaying a .rf.gd advertisements page.
I have already tried clearing my DNS Cache but this has not helped.
Note that DNS cache is not just in your computer. Your computer is likely configured to use some DNS resolver too (usually the one from your ISP) which also does DNS caching.
This is why we say to wait for 72 hours. There is no sure fire way to clear a cache and be done with it.