NISSAN QASHQAI BAD QUALITY CAR 2014 MODEL

Since we bought a NISSAN QASHQAI from Nissan Witbank in 2014, we have had ISSUES AND BAD SERVICE from WITBANK NISSAN... The car has been sent there almost every month in the past Year.. The Engin indicator keeps popping up and the car then does not have any power at all meaning I can't drive more that 40km/h.. I had the car for ' service and still the SAME PROBLEM KEEPS POPPING UP.. Now Nissan Witbank say its due to the Dirty Diesel in South Africa... (Well then WHY SELL THE CAR HERE???) We Bought this car brand new and since the first month we had problems...NISSAN had the car TODAY 27/07/2015 to fix the problem AGAIN AFTER IT WAS THERE 3 WEEKS AGO FOR THE SAME STORY, but the car was sent back, and NOTHING WAS FIXED AND THE PROBLEM STILL REMAINS THE SAME... THIS IS COMPLETELY UNACCEPTABLE AND POOR QUALITY????ALTHOUGH I SPOKE TO NISSAN SOUTH AFRICA AND IS STILL WAITING FOR A REFERENCE EMAIL, THIS JUST TELLS ME NISSAN DOES NOT CARE.