For future cases, the best strategy here is to call them the instant their phone lines open up. For a west coast person this can sometimes mean calling at 5am or something.
This is unconventional, but what about writing them a letter? Address it to the CEO and mention that you're also sending a copy to the FTC. I presume someone is going to open that mail, and while this isn't going to resolve anything quickly, the advantage is you don't have to wait on the phone for hours...
Certified mail might get through to someone important. Not super cheap, but potentially worth it.