Who called from 4123871121

Have gotten the same call at least 3 times this week from different numbers. Voice on vm asks hello?

Several calls from this number.  Harassment?      No voice mail.

Multiple calls over the past 3 days, mainly in the evening from the same number.

Called several times during last few days but never leaves a message so It's probably just a nuisance call.

Every day I am blocking a new phone number.  Most of them from area code 412.  I'm so done with the DNC list, it's worthless.