Beware of this New Visa Scam Phone Call!
I groggily answered the ringing phone at 6am, and was alarmed to hear an official-sounding robotic voice. “This is the alert system with Visa (or Mastercard) account services!” It went on to tell me that there were two suspicious charges to my Visa card.

Claimed to be from "The Window Company". When I said I didn't know what they were talking about, the just repeated the "Window Company!" (as though they thought I would be expecting their call). Hung up when I asked what it was they wanted. I'm guessing a genuine mis-dial.
Asked for me by surname but when challenged who they were, hung up .