All of our support emails are tracked, and generally speaking, support emails don't go unanswered. You have a comcast email address, and comcast seems to refuse emails more than any other email provider.
If you didn't do so the first time you wrote support, please take a photo of the serial number of your H9 with your phone or whatnot, and email it to support@eventide.com. We ask people to send us a photo of the serial number, because we've had cases in the past where people told us the wrong serial number.