You have already remarked that you will not believe any reply that we make but in the interest of honesty, we believe it is important to address your accusations.
You had originally booked a walking tour of Milan which would include entrance to see the Last Supper. As you may or may not know, entrance tickets to see the Last Supper must be bought with ample advance time (especially during the high tourist season) therefore when you contacted us asking if you could change the tour to the next day, it was explained to you that, being such short notice, there weren't any entrance tickets available to the Last Supper. The walking tour could have been rescheduled but, for reasons completely out of our control, it would not have been able to include seeing the Last Supper.
As for the subsequent cancellation of your tour, which you requested, as our website and as the Viator site (on which you booked) clearly explains, the free cancellation policy is for cancellations made up to 24 hours before the tour. According to our notes, and despite what you claim, your request to cancel was made less than 24 hours prior.
Your warning for buyers to beware is valid; buyers should be aware of the conditions of their purchases and, at the same time, respect the explanations given when it is necessary to impose these conditions.