My insane ability to recognize voices has me thinking that the caller was feigning friendship with the Richmond-ites and was actually George from Bergenfield/Alex from Anchorage/dude who wanted to talk/sing about Styx repeatedly, just based on the reverberations from within that dude's sinus cavity.
Hope I'm not deflating any great reveal that dude was planning, however pointless.
If my guess is right, it leaves Mit Hamine all alone, abandoned, screaming into the abyss.