TLDR; BEST PRICE GUARANTEED IS A SCAM AND CUSTOMER SUPPORT IS A SHAM! DO NOT ORDER FROM VIATOR We visited Mykonos on June and wanted to book some tours. When I first entered viator I got a promo pop up stating I'll get 10% off my first purchase if I'll register. So I did. The promo stated I'll get the discount upon checkout. So we booked 2 tours: 1. "Discover Authentic Mykonos" - 45 euro per person including transport. 2. "Small-Group Yacht Cruise to Rhenia and Guided Tour of Delos" - 95 euro per person not including transport. After booking, I contacted the local operator regarding transport, they wanted 50 euro for transportation!! For almost quarter from the total price they should mention it in the details!! Not only I didn't get to promised 10% off, but I also found "Small-Group Yacht Cruise to Rhenia and Guided Tour of Delos" for a MUCH MUCH LOWER PRICE - 94 euro INCLUDING TRANSPORT!! Obviously I cancelled my booking with viator immediately as they have a VERY STRICT cancellation policies! I contacted viator in their contact form regarding their "best price guaranteed" policy - till this day I didn't get any response. I searched for a phone number in their website to contact them about this subject - there was none! When I finally found a phone number (in their facebook page) - it was only for booking trips. They can't help with "best price guaranteed" policy. But "they have updated my file and will pass it to the relevant department" - but they can't send me any proof of this so called "file" and never contacted me again.