How fare to Kayole changed mid-journey

Matatu conductors are becoming increasingly rude. I was traveling from Nairobi CBD to Kayole very late in the evening. At first the conductor said that the fare was 100. Then it rained before we departed, then immediately we arrived Donholm the conductor completely changed and was now demanding 150.

It was chaos all over the long bus, passengers complaining others shouting and demanding to be alighted. I remember one passenger even went ahead to hold the steering and remember we're on a highway.

I really wondered, if the fare is 100 let it be 100