It wasn't Seamless, but this happened to me with either GrubHub or Postmates one time. The app said the food had been delivered, but it was nowhere to be seen. They re-sent the order which did arrive, but the delay was annoying. Do they ban drivers who do this? Between the ridiculous fees and the apparent shortage of drivers that makes every delivery take an hour or more even if it's from a restaurant that's nearby, I try to avoid that shit as much as possible. If a restaurant also does their own delivery, I'll choose that 100% of the time because it's always faster and less expensive.