Have patience Beavis. GP always responds to emails. It might take a couple of days longer, depending on the volume of messages they're receiving. I'm sure it's busy right now, with the release of several new planes, and the end of the flying season fast approaching. People are desperately trying to get planes in the air, radios fixed, etc. etc., before the snow flies

You can find out ANYTHING about GP, including their customer service phone number by going to their website: http://www.greatplanes.com

Give them a call if you can't wait.