Perhaps there are some fundamental problems here if it's legal for you to be extorted by debt collectors because some office worker decided to not leave a voice

Perhaps there are some fundamental problems here if it's legal for you to be extorted by debt collectors because some office worker decided to not leave a voicemail. And O The Irony! that one reason you're forced to make yourself available at a publicly known phone because of the threat of someone extorting you who is themselves not available at a publicly known phone number.