You can dial *611 from your cell for help or send a message to Verizon Wireless Customer Support
You should understand that the carriers stand will be that you probably did use the data.
IN cases of a minor overage of 1-2 GBS is may be a lack of understanding data use.
IN some cases it is a defective phone or application. If an app is running amok or the phone defective the overage can be very high.. If this is the case, factory reset or replacing the phone may be required and deleting any malfunctioning apps is a must.
IF you can look in settings, data usage, to see which apps are using excess data, it may help solve your problem without help.
IF you have a Windows or Android, running in safe mode can identify if it's the phone or an app.