"Unknown Name". Male voice said hello a couple times then let my answering machine run for a while before hanging up. Noises in the background sound like multiple people were present. (Call center?)

Middle Eastern male calls and tells me I have a problem with my Microsoft windows.  I explain that I have a Mac computer and they still call multiple times a day.

Where in North America would that number work, the fourth digit makes it invalid? Spoofed numbers contain tricks and deceit. If you're taking the calls in any way, they'll keep bothering you. Don't engage in conversation with these thieves either. If you're taking them and get any random calls with a foreigner on the other end "about your computer", immediately hang up on them.