nloshaw, we want to ease your frustrations and prevent future negative billing experiences. Have you had a chance to view your actual data usage sessions for your line online at My Verizon? http://bit.ly/xB4iTc
We recommend that you disable data for your applications in Settings>Cellular>Scroll down to applications>Disable Data for apps. This will only allow your device to access data for those applications when it's connected to Wi-Fi.
Additionally, it's also helpful to add the Family Base feature which allows you to set data allowances for your lines http://vz.to/1dJRZEC
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