I have this exact same problem. Our data usage has more than doubled in the past couple of months. I even payed the $30 extra a month for an additional 500 gb data and my bill is still $50 extra for data overage. We have changed nothing about our activity on line. We are doing the same thing today as we have for over a year and all of a sudden we are going way over our data usage. My data usage just restarted on the 7th and already it is up to 269 gb. That's only 5 days in. At the rate this is going we will go over on usage by the middle of the month, even with the extra 500 gb added. This is beyond ridiculous!