This is the second time I've received a message from a person (1st time man with heavy accent) this time a woman with a heavy accent.  Telling me that my computer is being hacked and that their company is going to help clean up my computer. I went to my computer and she told me to delete YAHOO and type in INSTASUPPORT 247.COM.  I asked her name and she said Joanna Parker and I asked her what number could I reach her at and she gave a number but not even enough numbers to adequately call back.  I got the number 217-853-3092 from my caller ID.  I told her I had a friend that is a computer expert and she said he couldn't help me only  I could do it.  She was surprised when I told her I had a mac computer.  I said I was going to notify my friend ( he is a tech person at the local university) and then I hung up.