Hi Iruhaku,
Thanks for coming back to us. We're so sorry that you're still experiencing issues with this, can we ask if you have registered and can't log in or are you trying to register and keep getting this message.
We only ask as there is still an ongoing issue with customers who are trying to register any 3rd party email address, such as (gmail/hotmail/live etc). If you're registering with a Virgin Media or NTLworld email address it will be fine.
Please can you let me know of the above so we can assist you further.
Kind regards Jodi.