I've received several calls from this number in recent days. I've let it go to voicemail (never received a message). Today I answered saying "Hello" after a few seconds a machine asked "are you there?" several times while I jokingly said things other than "yes". After about three times it hung up. Just less than an hour later it called again (a few minutes ago) I simply picked up the phone without saying anything and waited about 5 seconds before the machine on the other end decided to hang up.

Hang up call, have gotten calls from this number in the past, never leaves a message.

It keeps calling and never talks

I received a call, and did not recognize the number, so I did not pick up.  They did not leave a message. After about 30 minutes, I tried calling the number back and received a message the number was not valid.

Keeps calling and no one speaks- Block this caller