I received this similar notification before and it turned out one of my computers was hacked and was used to make unauthorized purchase in my Target account after the hacker had gathered information for a while. I didn't pay attention to Cox alert and experienced a lot of trouble trying to work with Target to get the mess sorted out.
I would suggest you do a fresh install of OS on your computer and change your remote control application's password, like that for the teamviewer account. And also change your gmail and retailers' account password. Use two step verification wherever possible and don't exempt your usual computer from the two step verification.
Cox's hack alert is real!