Thanks for posting on our community forums. Sorry to hear that you're ntlworld email address has been compromised. Unfortunately, as this email address is your original and primary email address, we would not be able to delete this email address for you as you still have an active account with us.
We can delete any secondary email addresses but not primary. Can we ask if you have changed the password on your primary email account? If not please follow the link here.
If you wish to create and alternative email address like a gmail account and have your Virgin media bills be sent to this this address instead, this is something that can do by logging on to your online account and follow the instructions here.