Hey Rika,
I had the same problem and I thought it would NEVER be accepted! Finally I called NVC and asked if I should re-send the email. The customer service rep told me "yes" so I did, and I got a response that the Choice of Agent had been accepted
that day!
I would just either re-send it (you should get another autoconfirmation email but this time it will say "Thank you for your
recent inquiry...") OR just call up NVC and ask if you should re-send it.
That's what I would do.
Good luck and I hope it gets accepted very SOON!