Hmmm... I got similar e-mail from someone who wanted to join my site - he sent me e-mail with a complaint, that he got this message:
Thank you for your interest in making a purchase from
http://mydirtydrawings.com/. For your protection, your transaction has been declined by CCBill but may still be eligible to be approved following some additional action on your part.
Please call our Consumer Support Department at 888.596.9279, or the International toll free number below if outside of the U.S., to proceed with the process if you have not completed your purchase elsewhere.
I've had conversation on mail with the same guy - who told me that he was able to join other sites with no problem / Verotel using sites/.
However I spoke with the ccbill's support and got this:
Unfortunately I can't confirm any details with Verotel, he will need to contact our consumer support department to verify why it has received a soft decline from our billing system. I apologize but I don't have any other details regarding his transaction attempt and contacting our consumer team via email or by phone will resolve this issue.