Sudden data usage is typically from doing something with wifi accidentally turned off you'd normally have on for. Think cloud backups, big downloads -- that kinda stuff.
If the data was from hotspoting, computers can easily burn through data with background processes.
We know how important it is to have your overages properly reviewed. If you would like us to look into it, please leave us a Private Note, or reach out to us online @VZWSupport on Twitter or Facebook. You can also reach Verizon Wireless Customer Service at 1-800-922-0204.
justin300, we want to ensure that your services are working as expected, and we're here to help. What is the zip code and nearest intersection that you're having this particular issue?