as @Christy_D says a ‘gone away form’ means that a previous occupier of that property still has a ‘live’ VM account and they haven’t told VM that they are moving away so as far as VM are concerned, they are still there, using the services and paying for them.
I believe that the form is a claim that you have now moved in and the previous occupant has gone, now you will understand that VM just can’t take your word for it and need to make reasonable efforts to confirm this. Realistically there may be some delay until you can get a connection in that property in your own name.