All i receive is the news on Plex that cost me $4.99 how do I cancel and how to i get movies
Plex isn't a media provider. it's a Media Server for your own/owned content.
Check out the What is Plex video to understand what it does and doesn't do...
You can manage your subscription directly from your Roku:
https://support.plex.tv/articles/219867627-purchasing-a-plex-pass-subscription-through-the-roku-app/ --> cancelling via Roku...
https://support.plex.tv/articles/201580107-plex-pass-subscription-management/ --> cancelling via plex.tv
We are not a content provider like Netflix. We don't provide movies. You get them by ripping your DVDs or whatever means you have.
You can cancel renewal by going to your account page at https://app.plex.tv/desktop#!/account clicking on subscription on the eft side then canceling renewal. If you want to contact billing you can do so at https://www.plex.tv/contact/?option=plex-pass-billing