Nissan south africa what a disappointment

Very disappointed in them we still waiting for a new car that we took back for just airbag light display. It is now 6 months waiting no alternative car was given since they are still waiting for the part. No help from Nissan head office, car is with the and we are still paying installments very month.. HAI this is just not fair. Any help from anyone or point us to right people to help will be approved by us. Nissan south africa what a disappointment poor customer service