i think it would help if you took a step back to look at this situation. What do wizz air gain by transporting you to CGN? they save the cost of putting a plane load of people in hotels for the night.
what do they lose? they have to pay another crew and fuel to fly an aircraft there to collect your flights pax. they also lose a home based a/c for the next day operation. a 5 figure loss for 1 AOG.
this is an extra ordinary event. it is not planned and certainly not welcomed by you or by the airline.
fixing a defect depends on having spares and qualified manpower at the AOG base. if this is not available, the airline will look for the best possible solution. in this case it was bussing you to CGN.
i agree with wizz in this instance...sorry!