Disappointing customer service

I ordered a Taxify on April 19 2018 for two people from Berea in Johannesburg to Empire road, Parktown. This was for a distance of around 8kms. The trip fare showed between R40 and R55. To my surprise, the driver took the passengers to Boyseens first and he seemed lost on the way. When he arrived at the designated place, he told me my fare was 150 and he also agreed his navigation equipment was faulty. I flatly refused to pay and told him I could only pay R50 as this was the amount I had paid for a similar trip just few weeks before and the fare showed between R40 and R55. To cut the long story short, despite my appeals to Taxify (which they never notified me they rep****), they blocked me from their services despite being a fairly regular customer. I am very disappointed.