I have exactly the same problem and have been onto Tech for most of the day (via text) and changed my password...I can still not access my email or even get to the sign in page on webmail. I look forward to seeing an answer to this issue.
I'm going to try and reply to you both, but please do try not to jump in on other people's threads. Your issue may have the same symptoms but not the same cause. That is how it works in tech stuff.
If you account has been locked in the circumstances described it has been done by Virgin Media security team because your account has been detected as sending spam. That means the spammers have discovered your password and are using your account credentials to sending spam from their systems. Something you can't see but VM can.
So the first step is to change your password. The second step is to wait here for a VM staff member to pick up these issues and get your mail box unlocked. The earliest that will happen (pick up) is tomorrow.
But if this not the first time this has happened you have an uncomfortable truth to face. Your system must be leaking your password. Probable cause is a malware infection, or you are using such easy to guess passwords that a five year old could guess them after a change. You need to do something about detecting a malware infection or this will keep repeating itself.
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Thanks Melissa - unfortunately not ..it asks again from my password, then the message "Cannot Get Mail..The mail server imap4blueyonder.co.uk I not responding. Verify that you have entered the correct account info in Mail settings.