1 year after I still have same issues on the Merc.

It is a year since I bought my car at MitMak and I have experienced more sad times than happy days with the C250D coupe Mercedes-Benz. The issues on this car are never resolved and it is always issues to get them resolved. From the day I bought the car i complained about squeaky brakes that makes noise and was told that they will be quiet at some point. This car has been having issues with leaking on the body that ends up killing my headlights not to function. As i type this headlights are not working. I am not able to adjust the driver's seat and the issue was attended but keep on recurring now and then. My car sound system Harman and Kardon which came with the car got damaged by the leaking which i believe is not fixed as now my backlights are also misbehaving. I am not getting joys on this car while i pay monthly installments and also insurance to top it all. I have been to MitMak depot numerous times even sacrificed my time and diesel thinking that the issues will be fully resolved. The car will be sorted for a few days then starts again. I traded my Polo GTI which was still in superb condition for this car. What must I say or do to have peace of mind. The car that MitMak sold to me, is not worth the trade in I did. This is the 3rd if not 4th review I do on this car.