It's too late for you, but for others reading this: You can get rid of most ads on Android TV by enabling "Apps only mode".

The only downside to enabling this mode is that it's a bit more difficult to access the play store when you need it because they hide the home shortcut to it as a final f you.

When you need to install a new app you can still access it by going to settings -> apps -> show system apps -> scroll -> scroll more -> keep scrolling -> Google Play Store -> Open.