This is why I just don't listen to voicemail. There is no reason to leave a voicemail, just send a text.
I had the California DMV try to reach out to be about some form inconsistencies and they only contacted me by phone and voicemail. (To their credit they left me 3 voicemails through a very busy day I had.)
There was no other way they were going to contact me before letting my car registration expire.
Sorted it out, but barely. Very frustrating to have that sort of outcome from the root cause of phone spammers.