As has been reported in many, many other threads (you would have to do a search for "contact estes" or something similar), their web based contact system will sometimes filter out some attempts at contact as SPAM. if you do not hear back from them after 2 attempts, you should use the telephone for instant contact.
I built a D-Region Tomahawk, but lost the tiny nose cone tip. I called estes to ask for a replacement. They said that now that their parts are made in China, they can't send out a replacement part any more. So they sent me a whole kit. Now I have spare parts for the whole thing. :cool2:
I tried contacting them a few weeks ago about a warranty issue via their web form... After a couple of weeks without a reply, I went back to the website and notices they took the web form down and now list their email in it's place. I sent an email that morning and got a response just a couple of hours later. Their customer support is awesome once you get a hold of them!