Dear Guest, you first pre-reserved guaranteed services from Viator, then after reaching the venue you checked prices locally with roadside and unsafe vendors. And then you try to force genuine operators like us to operate like a roadside taxi vendor. Few dishonest travellers like you try to torment genuine operators but we won't ever come under pressure. You are always free to cancel and go with a toute OR roadside vendor. But you will never do that but you also don't want to pay a premium for consuming genuine services.
This shows your character and dishonesty. Also you are telling a plain lie that the tour was about only a driver, but what about the traditional lunch which you happily devoured, what about the guided tour in the "Spice farm"???, and the entrances which were paid in advance???
Even Backpackers seem much more honest than you, because they never bother any operators and take the risk by booking on their own at the respective venue. But you first pre-reserved everything from the comfort of your home and then behave irrationally after reaching the venue
Regards
Jai Singh