Actually is Vonage. I called them back after they repeatedly called my work phone. The representative was very nice and submitted a marketing form to remove my number.
Since I never got to the phone in time to see what the actual caller wanted and they never left a message, the representative said it might have been sales but there's no way to know so I am leaving it as Unknown.
He warned that it could take a couple of weeks for calls to stop but at least he did do something about it and was very nice.
This number calls all the time. I called it back and it was auto-response (first in spanish); then in english it asked if I was transferring my current vonage number to select 1. I didn't let it play through any further, I've never been or never will be a vonage customer.