I moved this post to its own thread because it was appended to a long solved one. That is a recipe for it getting overlooked.
The short answer to this question is that as you are not a VM broadband customer (my assumption) there is nothing VM will do to give you access to the address.
The bouncing between VM and Talktalk is supremely annoying and displays a depressing and continuing ignorance amongst VM staff as to the fact that virgin.net addresses remained under VM control despite the sale of some customers using the old VM national service to TT.
Frankly I am not sure that I should be trying to give people access to accounts they are not entitled to have. But I'll give you a hint and you'll see what happens. This has a slight chance of working. If it doesn't that is the end of the line.
When you log into VM web mail use the forgotten password link to try and reset your password. This will only work if you have set security questions for the account. You may have to try the answers in upper and lower case letters.
When VM staff pick up this thread all they will offer is their help to delete the address permanently. Indeed VM are actually running a programme of deletion of this type of address at the moment. You may have been caught up in that.
As a Very Insightful Person, I'm here to share my knowledge. I don't work for Virgin Media.
I think I started the thread from which this new thread on the same subject has been started (for the good reason mentioned).
I had a virgin.net account from soon after Virgin Internet started in the 1990s, at first on a dial-up basis. Long story short, Virgin Internet morphed into Virgin Media providing services only over their own cable network. Customers without access to Virgin Media cable (like me) ended up with a virgin.net account for free - which was obviously not a sustainable model - and VM sent me many emails explaining that my account would soon be cancelled unless I transferred to VM - which was impossible where I lived. So I migrated all my important 'stuff' to another email address. But it took many years for VM to finally 'pull the plug' and even when my account stopped working it remained possible to 'resurrect' it by changing my password, as mentioned above. Very odd, and it only worked a few times.
Eventually, of course, it was permanently cancelled though goodness knows why it took so many years. I can't honestly complain about it being cancelled as I had enjoyed many years, maybe ten or more, of free email. My only complaint is that VM couldn't or wouldn't offer any means for me to keep my virgin.net account, even for a fee. It would be interesting to know the percentage of VI customers who could not move to VM even if they had wanted to.
I appreciate this is all history now but it's disappointing when a company abandons customers in this way. It certainly doesn't encourage me to think of moving to VM if/when their service arrives in my neighbourhood.