Hi:
Have you tried a hard reset to clear out the device and to try the setup again? If that doesn't work I am sorry to say you may need to call Sprint and have them remove and reactivate your vision services. It is entirely possible they set the account up wrong.
Is this an account that has been working and just stopped? I am not sure why you were trying to reset it.
Benjie is correct in asking the obvious, have you contacted Sprint? You seem to be doing everything but what the message is telling you...Contact Sprint. No one looks forward to that exciting prospect, but sometimes you just have to. You would rather discontinue using that feature over calling? Did you kill one of their techs and you are afraid they will find you?
Do the call and try to get to a level II tech.
Good luck,
SteveTaz