ATT said I get 100 GB a month with Velocity but I'm not, what to do?

The rep Friday TOLD us that adding a line and getting the velocity for our internet use was the way to go. She said we get 100 GB a month and after that we may be throttled a bit.

We just hit 17 GB due to my sin downloading some games, WHY IN THE HECK am I getting text message warnings about approaching 22 GB?

this is crap! She told me we get 100 a month on the hot spot Velocity unit!