Tim Smith, Vonage Network President (or at least someone did on his behalf) has responded to my e-mails and this post.
Mr. Rabinovitch,
I regret the difficulty you are having with our service of late. While
I cannot promise you that the issue you are having with simulring and
network availability will be resolved to your satisfaction, I can commit
that I will look into the matter to try to understand the root cause of
the change in behavior of the service and what our options are with
respect to that change.I will follow up with you as soon as I have some data back from my team
on the issue. I realize that we may well not be able to resolve your
issue and/or resolve it in a timely enough manner to save you as a
customer and very much regret that you have had a negative experience
with us.Thank you,
Tim Smith
President, Vonage Network