Unexpected Enormous Usage Increase

I have a 'hot clue'. If COX had done a 5min network analysis on the traffic flow, they would have noticed that the excess traffic was flowing into my network (incoming) from a site in the aaplimg.com domain, which is Apple's CDN (content delivery network) for download/installation of OS updates and applications. Even without COX's help, though, I was eventually able to suss out what had happened albeit it took several extra days.

Turns out that my 'work' Mac laptop at home (part of my network, I use it for my job at a all-virtual company, the laptop is the property of my employer) has been downloading a massively large software development toolsuite multiple times per day in the background for no apparent reason. One download by itself is 12.3GB, and my laptop is doing 7+ of these downloads a day with no notifications to alert me. This is an errant behavior and almost surely due to an oversight/error by the corporate system administration team. Not a hacker. I have opened a ticket with the admin team to have this investigated.

Update...

After investigation, the solution turned out to be straightforward. I used the Apple 'Launchpad' to simply delete the problematic development toolsuite (called 'Xcode.app') from my laptop and allowed it to be reinstalled. Instant cure. Locating the cause of the problem took nigh on 3 weeks and 3 phone calls, and a mere hour or so to fix. Very baffling, elusive, and obscure underlying cause for this problem; glad I didn't take COX's offer to boost the data plan by $50.