Customer mistreated and disrespected

My uncles car us been at nissan Hartfield for 12 months now. He took it in for service and whilst they were servicing it. There was a problem after a problem until today the car is still there.he is struggling with transport and but dealership doesn't seem to be bothered. A hole full year. He wS told that the car was taken to specialist to fix it since nissa is not able to do anything g after the broke it. He asked that they borrow him a car. They refused.he even logged a complained of which is still hanging. Should we seek help from Xrepo from mzamsi magic or go to ombudsman for help before this is resolved.this is a poor ************** and disrespect.12 months hell no.