Problem logging in

I tried to log in but they ask about my virgin media id and I have no idea what that is. Also I ordered the broadband and everything worked well but now I don't know how to log in , how to pay for next month and so on. I spoke with an advisor online and he was not able to confirm my identity because I didn't remember the due date . I really don't know what to do now? I didn't received any letter or email from virgin media !?!? With details or something