Not much you can do beyond what you've done. A month is a LONG time. My guess is the BGO has let is slip through the cracks, now can't remember any of the details and thus is stalling. Not a good thing, BTW.
The good news (sort of) for you is that, once your packet is complete and a month has gone by, the Admissions Board will review the package sans the BGO interview. In the meantime, they will notify the Area Coordinator (in theory, the BGO's "boss" remembering it is a volunteer organization) who will likely ping the BGO. Still, no one can "make" the BGO do anything, sad to say.
You might try contacting the BGO once more. You could contact the AC but the AC already knows of the issue so not much point.
Sorry this has happened to you!