The same thing happened to me. I paid, I was doing the exams nicely, and now they disappeared. I was a bit suspisious in the beginning because the course fee had to be paid to an individual called Scott Austin, personally, but I wanted to start some course and then in the end, I paid. I figured he is just the site owner and so that is why you pay to him ...
Now I learned that he also goes under the name Scott Jackson, his partner in crime is Katie Hope alias Katie Layton (probably all four names are fake ...). He is a professonal scam artist and he has repeated this scam several times over. Plus, the course materials were stolen from other, reputable and non-fraudulent institutions. Of course, even if you did finalize the course, the "diploma" would be worthless. I have learned this from this website about scam: http://thehealthsciencesacademy.org/online-nutrition-courses-names-providers-and-sites-that-are-a-scam-and-fraudulent/