My data usage GS also zoomed up +50% Nov/Dec, and another 50% Dec/Jan.....and am on track to continue this pattern.
Just for kicks I maxed out all if the 8 usage descriptions on the Data Usage Meter"....and it only indicated 964.30 GB!!
My latest bill indicated I exceeded my 1TB limit by 498GB.....i was billed $100.
I called COX....waited for 46 minutes....after describing my situation with service rep......He indicated only a Level 2 rep could answer my technical questions.....level 2 could not tell me which usage was causing numbers to escalate.......not happy..........something very strange is going on....may take this to another level.