Excessive data with hotspot?

A two hour movie cannot be 8GB. They run about 3GB.
Yeah, not really sure about the specifics. Just going by what Verizon told me in their email - their website isn't specific enough to tell me exactly what was downloaded, but my hotspot was definitely the guilty party.
I recently had an issue were my Verizon Jetpack/Mifi appeared to be taking a large amount of data. It turned out that Windows 10 with Office 365 (2016 Beta) was my biggest problem with the new automatic updates. They use streaming updates (cloud connections) to keep the products updated. I found it was best to try to turn off automatic updates on cloud-based products.