Hello Mattlannan31,
Welcome to the community!
It looks like there might be an issue with the system. That amount of data usage certainly does not seem possible. That said, it is possible to exceed your data allotment if you just activated services. You should note that your billing cycle would not usually start until a few days after you activate services. As such, any data allotments and monthly costs would be prorated for the few days before your billing cycle starts (see here). So, in theory, your daily allotment of data would be 30GB ÷ days in month.
However, as far as I am aware, the new plans should have Data Overage protection (see here). Once you reached your data limit, you should have received a text message notifying you reached 100% and the option to purchase more. So I don't think you should have been able to use additional data unless you purchased more data.
You should note this forum is community-driven and not intended as a venue for customer services. We would not have access to any account information. You might consider contacting customer service to verify the actual activity on your account. In addition, they can also be contacted via Live Chat, Facebook, or Twitter. Those methods can be accessed via the contact page posted above.
Hope this helps 😀
Cheers
