Welcome to our forum, I am sorry you are having problems playing elder scrolls, we will do our best to help.
To start with apologies we currently have a problem in the area with intermittent low SNR and this may impact your gaming. Our engineers are aware ref F004731200 estimated fix 17 OCT 2016, I have updated your account so hopefully if we have your correct mobile number you will get SMS updates.
Are you connecting the xbox with an Ethernet lead or wireless? We would recommend a wired connection for gaming please.
The built in speed test for the xbox does not seem to be that accurate by the way.