@Rbailsey We are very sorry for your bad experience. We are actively trying to figure out some solution for HBOMax and Hulu when on Roku TV. We will report back here but you can also follow this thread where another user reported this: High Data Usage - #31 by Peter.
Also, as we have posted on the other “Bring Back Data Extender” type threads on this forum, we are actively working to figure out if there is anything that can be done about this.
Lastly, about your inability to view previous months data usage, we will ask the apps team using your account specifically on why this might not be working.