Sandown Motors Failed to Fix My Mercedes-Benz GLA200

Very useless and very unreliable a hole mercedes-benz sandton and Sandown Motors. I bought a mercedes-benz GLA200 from Sandown Motors and ever since the car was bought the car has been giving me problems with the wiper blades juddering. they have replaced the windscreen 4 times and they have polished the windscreen several times and even adjusted the wiperblades and new wiper bladed replacement but the problem still underlies and is stuck with me now. Several customers have probable had the same problem as me but they must have been refinanced or got a replacement vehicle with the same value Mercedes-Benz Sandton and Sandown Motors has failed to rectify and fix this problem that i am having with my Mercedes-Benz GLA200 as the wiper blades are still juddering in the rain when the car is driven in the rain. This car was bought in 2018 and we are in the year 2020 and i have beene up and down to the dealership with this very same problem. Mercedes-Benz Sandton and Sandown Motors has failed dismally to fix this problem yet if i was most probably a white man they would have replaced or refinanced me for a new vehicle are they doing this to me as a customer because im black yet if i was white i would have probably gotten a new vehicle i am a customer and i have been buying cars for years from this dealership/branch but they have failed to look after me as a client after spending half a million on a car that has factory faults whoever is reading this please dont buy Mercedes-Benz the worst brand to buy or spend ur money on. And they denied my report when they wer given a call on hellopeter which goes to show that they dont care about me all they want to do is chase after numbers