Hello Hayley, thank you for replying.
It has always been the same account, although I did once change the email address associated with it.
I think somehow the Virgin system might confused as I changed my login email address to @virginmedia.com (from the @gmail.com) address I was using for years. So;
1) @virginmedia.com - set up and used with Virgin technician when I set up my broadband etc on the day
2) I changed it to @gmail.com from within the account page and used this for years until one day within the last 6 months or so...
3) ...I decided to change it back to @virginmedia.com and I think maybe its something to do with this changing back to the original account email name that has somehow messed it up.
I can provide my Account number and Area reference and anything else if it makes it easier to get this seemingly unique issue fixed?