Thank you for your words!! It is sad you didn't wrote about you didn't show up on time for getting picked up and we patiently waited more than 30 minutes (the tolerance time is 10 minutes) and assisted you in order to make your tour happened. According to what you wrote about the ATV you took, it was fine, you just needed to gave it gas when it started to loose power, which happens and it's normal with every motorized vehicle around the world. You signed a waiver form (everybody does, in every serious and organized tour), where you have stated you did understood the Tour's nature, the risks and the restrictions involved. You didn't fit on the harness needed to zipline, that is the reason why you didn't zipline, because of your own safe. Your safety is first!! Unfortunately, according to the terms and conditions you agreed and accepted at the moment you booked the tour, and did it again signing the waiver form before the tour started; none of the reasons exposed are valid to process a refund.