At this point, if it's a phone number not in my contacts I'm letting it go to voicemail. The problem is that I'm getting desensitized to voicemails. After hearing "...Blue cross, Aetna, blah blah" health insurance spam voicemails 5x a day I guess anyone would just start deleting them without checking. It's infuriating.
Also, hope your father is doing alright!