Who called from 7860000000

CONSTANTLY get calls from 786.000.0000! No one is on the line usually. sometimes, I get hung-up on. Maybe it's my breath?

I've received a few calls from this number this week and have not answered. They never left a message, until today. The woman (and I use that term losely) on the end left this lovely message "Blah Blah Blah [***]!!"  You can bet the next time they call I WILL answer and I'll make it very clear that they had better not call my number ever again!

I always get a phone call with no messages left.  How do I block this?

I always get a phone call with no messages left.  How do I block this?

Caller with an Asian accent (possibly Indian or Pakistani) trying to get me to run a program on my computer to check if someone has been putting spy programs on my computer that would affect the security of information I send on my computer.
Told him to get lost