Yep Scammers. They attempt to use an officious tone of voice and intimidate you and employ various strateges such as
a) trying to get CC# info with impossible scenarios like "YOUR windows operating system is generating errors on THEIR system" - uh huh
b) claiming to update your credit card or
c) as Peggy above reports trying to determine whether you are home or not so they can rob you blind.
Don't even bother to pick up the phone if you see this number, if you do and hang up on them they are liable to call you back repeatedly. AVOID AVOID AVOID
Received a call from 657-643-8348, was told they were calling about our computer, I asked if someone here called them, they did not respond, they hung up!