Contacting QB with complicated questions

I’ve been trying to call Questbridge all day but I keep being sent to voicemail after being on the phone for ~2 min.

I’ve already emailed them but the response I got was really vague. I left a voicemail, but at point I think I just need to speak to a person about it.

I called both numbers listed on their website, (650) 331-3280 and (888) 275-2054. Is there a better way I should be contacting them?