I don't know if they are targeting individuals or ripping everyone off at the same time.  You will have some unexplainable surge in data, hundreds of dollars worth, and it will not stop even if you turn off your device.  They will blame it on you.  I have dumped them for good.  I was lucky that I was at the end of most contracts.  They are not honest. If it has not happened to you, they will get to you.