There is a series of numbers from "320-308-xxxx" calling several times a day to my 952 area code number (no longer live in MN).

I don't pick up scammer numbers and they've left either 0:02 voicemails or a else a strange recording of an automated voicemail message ("If you'd like to leave a callback number..." etc.) w/ mumbling over it.

Ditto to above. About 4 times a day from 320-308 but last 4 are different. No msg, I don't answer these calls, probably scam

Calls about the same time daily.  I don’t answer unrecognized numbers.  They don’t leave a message when voice message recorder starts, then after a few seconds they hang up.