So Annoying Ads

On other apps, if you press 'Bad' on this type of ad, it won't appear the next day, but this one has been showing up for so many days. I was wondering how long it would take to successfully watch an ad, so I went back to the game after it popped up Google Play to continue watching. I started at 21:10, and just now after returning to the game and restarting it, I still haven't received the reward. Whether I press the back button to return to the game or swipe away Google Play and tap back into the game, the ad just keeps replaying, and I can't get the reward.