Thanks for your post on our Community Forums @jiffybloke, and a very warm welcome to you!
Sorry to hear of the difficulty you've faced trying to access your new account.
Can you please confirm if you have attempted to register for the new account?
When coming back to Virgin Media you would have been issued with a new account number, and possibly area reference number (if you have relocated since having the services)
Kindest regards,
David_Bn