Problem with a delight ad-unfair question

Hi,
I just got a delight ad (https://www.getref.info/top-ptc) with a question to answer correctly to be credited: the question was something like "which rank is Heedyou on this site ?" and the possible answers were all wrong (the too last were #8 and #10 whereas Heedyou is ranked #11 on this site). So I clicked on #10 because it was the closest answer and I thought maybe the ranking of Heedyou had changed since the ad was added. But I was not credited because of a "wrong answer" and because the "report unfair answer" was not working I couldn't report the misleading ad.
Delight ads are rare and it's sad something like this happen with one of those ads.