Xfintiy “Advanced Technical Support”

[Edited: “Unverified Phone Number”] or similar number claiming to be advanced technical support is a scam, don’t answer or call them back. I can’t believe after a few years it is still a thing.  I also can’t believe that after making an appointment on the official Xfinity app a few hours later they call.  How do they get that information so fast? Can’t trust anyone these days.  Has this been happening?