This is a fake number it's being used with spoof calls
Called claiming to be from Microsoft Security. Said there was a security issue with my computer. I asked "Which Computer as I have 2700 servers at work" When asked why not at home? "I work all day with computers and I don't want to even see a computer at home. I'll go to the server farm and call you back from there."
This # called my mobile, left no message. Has same first six digits as my mobile.