The message that you are receiving is stating the the page isn't redirecting properly. This is due to a redirect loop which would redirect your site infinitely, thus causing the page to be unavailable.
I have taken a look at your account and noticed that within your .htaccess file, you had some lines in there that redirected www.discounthba.com to discounthba.com, but your cart is set up in a way to redirect discounthba.com to www.discounthba.com. This was causing the infinite loop and the errors that you were seeing. I have removed those lines and you should now see your site operating normally.
My website has down from 3 days. It called 504 error when I try to browse.