Hi @devii
Thank you for your post and welcome to our community.
As @nodrogd has advised, it isn't possible to continue to use the set top boxes once an account has been closed.
Any V6 boxes being sold online are being done so illegally as these remain the property of Virgin Media and should be returned to us.
This also wouldn't work as they are registered to individual accounts/addresses.
I am sorry to hear you are thinking of leaving us.
Are you have any issues with the service? We would be happy to help here.
Please pop back to us when you can.