Caller ID displayed "SURVEY". I didn't answer (as anyone should do if they don't recognize the number), No message left.
So in these cases, this is what I always do:
Open Call History > Select Number > Open Menu >Select "Add to Block List" > Confirm! Now these numbers can still leave voicemail, which is a good thing in case it's a legitimate number belonging to someone that you do need to speak to.
This is what everyone should be doing when these numbers call your personal phones!