Airvantage Data Usage Does Not Match Service Provider

I am having an issue reconciling data usage from my cell provider with the data usage shown in AirVantage.

The device in question is a AirLink GX450 running firmware [ALEOS GX450 LWM2M (

My cellular company claims the device has used 140 MB of data in two days, while Airvantage still has the number as 54.66 MB for the month of November (Cellular contract runs from 10th to 10th each month.)

What directions should I be looking in to reconcile this information? Does some data usage get reported to the cell company that is not tracked in AirVantage?