We booked a day tour to see Chichen Itza with a provider called 'Cancun Vacation Experts' and paid through the website viator.com. On the day prior to the tour, we attempted to telephone Cancun Vacation Experts on the numbers provided on their voucher to confirm pick up. We also tried all of the telephone numbers on their website - and ALL WERE UNAVAILABLE. We also emailed the day prior through viator.com and did not receive a response. On the morning of our tour, we waited at our hotel reception from 7am to 10am and no tour shuttle arrived to collect us. We only had one day during this holiday to see Chichen Itza (a 7th wonder of the world) and missed the opportunity due to this company's extreme disorganisation and lack of professionalism. Despite having finally received an apology via Facebook from Cancun Vacation Experts, we have still not received confirmation that we will receive a refund. We were extremely disappointed.