Contact you phone carrier and request the number be blocked as a nuisance caller.
If they can't or won't help you, then next time they call, have a recorder handy.
Notify the caller they are being recorded and let them spew their threats, then contact your local police/sheriffs dept. and turn over the call records. Get a case number and then use that to force the phone carrier to block/filter the calls.

Failing that, ignore their calls, pickup and hang up immediately to block them access to your answering machine or voice mail.
If your cell phone is a smart phone, there are many apps to block calls based on user black lists.

google is stalking me....5 calls per day always from different number and different state....never ends

call is from 29 Prime, the toll free number is 888-513-7746. call back often.