Managing ads (site owners)
If an ad is live and you need it gone — it turned out to violate something, or you just changed your mind — use Take down on the space's manage page. This is different from rejecting, which only applies before an ad has been paid for.
Taking an ad down stops its billing immediately (the advertiser is never charged for days after) and emails them your reason. It also frees the slot, so if anyone's queued, the next bidder is offered it automatically.