Ever had a phone call from "Gizmo Diagnostics"?

Just got a call from someone that says he's from "Gizmo Diagnostics" saying that my computer (Lenovo L540) is sending error messages to their server (definitely not instigated by me - at least not intentionally!), and that they can help me "fix" my computer.  I played along for a bit - asked if I could see on my computer the errors they were seeing.  He told me to run the event viewer, which I did (eventvwr in run window) and saw a bunch of warning & error events - looked like fairly normal stuff, but although I've owned a PC since 1984, I'm not into the bits & bytes as much as I was years ago.  I finally hung up. 

Question for Norton and/or community - Have you heard of these guys, & do you know what they are referring to & what they do?  Any other comments on the above?  Thanks!