I got a call telling me that my windows operating system was infected and they could help me out... I hung up

This caller called my mother and told her to "shut up *****" after saying he was calling to diagnose her computer. She asked to speak to a supervisor, then he came back to phone pretending to be the supervisor, ultimately hanging up on her after saying "**** you *****." She tried to call the number back and it wouldn't work. I called from another number and someone answered, but this time it wasn't a message, I could tell it was a live person.

A Male with an Indian accent claiming my computer was sending a virus via my windows operating system.  When questioned very aggressively told me to get in front of my computer so he "could help me out!".  I hung up.

A very aggressive woman with heavily accented English warning me about a problem with my computer. Wanted me to do a control-r. Did not do, but the same number called back twice, after changing the id on the phone number.

Keep getting calls from this number but no one answers. What is this about??