I have a little new information:
I feel like I've called the AMNE receptionist more than I've called my girlfriend this week.
Anyway, this time, again, I got the standard, "Can I transfer you to her voicemail?" Instead of letting her transfer me though, I told her that I've left voicemails everyday and that I thought it was strange that the only person working in the AMNE office in the middle of a weekday is the receptionist. This woman and I talked for a few minutes and she told me that she doesn't work for AMNE, she's just the voicemail service for all the companies in the building - which explains why they never know when someone will be in the office.
Furthermore, she told me that there's hardly ever anyone in the AMNE office space because they're "out on the road a lot working on projects." When I pimped her as to whether she thought AMNE was a real company with real people honestly working or just an office with a phone, she was confused by the question but told me that they do work very hard, they just aren't in the office much.
Like I said, only "a little" information, but it was nice to have it confirmed by a third party that they haven't been avoiding/ignoring my calls and remain a functioning business.
Not a big deal, but figured I'd pass it along...