Account not found when trying to log in

I enter my details into the My Virgin Media app as they appear on my bill when trying to log in, and it tells me that this account does not exist. After looking on these forums its obvious that this is not a unique problem, and I really need this resolved soon as I need to check if there is any outstanding payments that need to be made ASAP. Could do with getting in contact with a staff member soon as this is giving me a lot of grief.