Spam voicemail without phone call
So yea....the title sums it up.
I use HiYa and Call Protect. I use S10 note plus.
But now spammers are leaving voicemail without having called my phone, or at least without showing any calls or missed calls.
How can this be stopped? Since it can't be ignored obviously, the voicemail might be an important call or emergency so you have to listen to each one.
I can't do the option of only allowing calls from my contacts, since I have children and family....and in an emergency they need to be able to reach me from any phone they have.
But that aside, how is it even possible for them to leave voicemail without showing a call or showing a missed call?
How do I put a stop to it?