It sounds like you really should be mad at Roku - they're the ones who implemented the ad-during-pause behavior. If the particular vendor you're upset with didn't advertise there - some other would have, maybe one you don't use at all, so wouldn't have the recourse of a ban. Point is banning that vendor still means you get ads during the pause, so doesn't really help. But throwing out the roku or complaining loudly to them might? Or might not - my AT&T DirecTV receiver does the same thing, albeit silently, so it's tolerable.
There's always options. Yarrr.