Just by occam's razor it seems so much more likely that it's a girl on the phone (e.g. Tuipassissippi's cousin) than him on the phone for 100's of hours successfully impersonating that female voice I heard in the voicemails. Like 90%+ certain that it's a female I'm hearing.
BTW if you think this is the craziest catfish ever you should read about the true story of
this guy who carried a 20-year long sexual relationship where he convinced his partner he was a woman, who birthed a child with him. Craziest catfish ever.