I booked an excursion in Mexico to go to Chichen Itza for 4 people which cost $800 CDN and the tour hosts did not show up at our resort to pick us up even though we were up and outside at 6am like they asked. When I put in for a refund through TripAdvisor they just ignored me. It's been a month and they haven't responded to my refund request at all. 800 dollars is a lot of money and I will not be using TripAdvisor again.