I am having the exact same problem, but with a subdomain account. When I follow the links to my domain and control panel URL, I get my browser/ISP's message that the page does not exist. Not only have I cleared my browser cache, but I've tried from multiple computers and multiple internet connections, so I know the problem isn't on my end.
I can also sign into my cpanel from the heliohost main site, but can't access FTP etc. I created the account May 20th, so it's been well over 48 hours.
My heliohost username is Evan and my subdomain is evansgame.heliohost.org. I'm also in a hurry to get working on my site.
Help with this would be greatly appreciated