Someone had a similar experience recently. See the recent Cox data usage discrepancies post. Since you have a Netgear router I would suggest you either setup bandwidth monitoring on it or figure out how to monitor your internet bandwidth yourself to see if the data you are using matches the Cox data usage meter. I don't have a Netgear router nor have I ever used one, but I suspect you should be able to setup bandwidth monitoring. Google search it. Probably will show you a graph with the data consumption that each device is using on your network over time. Cox does offer unlimited data use if you want to pay an extra $50.00 for it. Personally I find that to be an unreasonable price. I haven't seen anywhere where Cox is willing to work with customers reference unlimited data so don't expect a discount on that $50.00 fee. I look forward to your findings so please come back and post a comment after you figure things out.