Contacting Network Admins Of Large Internet Companies?

lisa asks: "I work as a sysadmin for a national DSL ISP. Unfortunately, we've recently found that @Home.com is not allowing connections to port 25 from some of our primary mail servers: this of course means that our customers can't send mail to theirs. I've called and talked to people in their tech support, and only after several calls have we been able to get them to acknowledge there may be a problem. The trouble is, I can't seem to get in contact with any network admins there. Even the tech support person I spoke with expressed less than hopeful sentiments about being able to get this issue escalated. Has anyone had trouble like this with @Home or other simliar Internet companies?"

"What is the best way to get in touch with a Network Admin or someone who actually can do something about a network issue in cases like these? It would be nice to know that just writing [e-mail] would get to their systems department, but I was told all of that mail goes through support first."