NISSAN BRITS DOES NOT WANT TO OWN UP TO THEIR NEGLIGENCE!!

My mother took her car for service at Nissan Brits. On day three, post-service maintenance, the vehicle started to arouse a funny noise. She then decided to take back her car to the dealership. On her way she heard a "bang" sound and immediately stopped the car. After all the inspection it turned out the old oil had not been drained and replaced with clean oil which also coursed the conrod to shutter. If it were altered, it would appear polished rather than gloomy. However, the Nissan Brits claimed to have poured new oil. Extremely outrageous falsehoods! This company refuses to fix my mom's car and also told us to go to the Ombudsman.