I am having the same issue. I'm three days into my cycle and Verizon is saying I've used 7+GB of data. That's not possible. Nothing has changed with our usage. Ayuda, por favor.
Of course it's possible. Please check your device and find out which application is using an abnormal amount of data. Unusual and excessive use is almost always a malfunction of the phone, and has nothing whatsoever to do with the carrier other than they report what's your phone used.