Dead air then someone said 'goodbye' in a creepy voice. Attempted callback...rang and rang

Called my work line; said they were calling from Microsoft about my computer.  I jokingly said I don't have a computer and they hung up.  Not the first time they've called.

Caller stated detected problem with my computer.I said hang  on ------  I  played sound effect
of battle stations,general quarters for them .Microsoft does NOT call you claiming they detected a
problem with your computer.Total absolute scam .