I had a lot of the issues you are reporting for account creation...Server down / busy...unable to process payment...Key already in use ETC.
I did have to run through the setup about 6 times. Each time getting the server is down or some other like issue. I then did the account setup with firefox instead of ms exp, and got a different error.
I logged out of the online web page close and refreshed browser and I was good to go.
I hope this helps.
Bottom line their servers are buys and just keep trying. It may say that the process wasn't completed but it very well might have been. Don't worry about multiple hits on your bank account as you can only have one "subscription" per account. And be sure to refresh everything, every now and again.