An easy check: 1) check your daily data with the Hughes usage monitor - get a sample of 24-48 hrs; 2) then turn off your camera wifi... 3) recheck the daily data after 24-48 hours. 4) compare #1 & #3 results. If it is the cameras, and high chance it is, you will see a drastic change in the two numbers (they are always on and video is a major usage hog). Another possibility is if you have auto downloads on streaming data on any devices at home like a laptop or ipad. Music and videos again are culprits. Is there a device at home that was left on in background, playing music or videos on a tv? Last, and hopefully not this...but if you have no firewall and your router password was changed to something really simple, it's easy to hack (since it IS visible to those in range)... Good luck.
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