Uber Pricing Issue

I checked the fares before starting and i dislike the way there is a range of pricing. However I was ok with the range which was from about R 260 to R 380. I accepted and left details. The driver arrived on time and was very pleasant and a good driver. The problem was that Uber were now deducting over R 420.00 which had not been in the range I had accepted. I complained and they credited me and charged the highest of the original range. It seems that Uber will try and over change and ifg caught then revert back to the highest they can get away with. Seems a dishonest and ********* way to do business.