Hyundai Benoni

Baught a pre-owned vehicle from Hyundai Benoni in February. I have been having a problem with an airbag light which won't go away, reported the matter within 21day of receiving the vehicle and its almost end of the year its still not fixed. I have done follow ups several times and I'm sent from pillar to post with excuses, which I take time off and use petrol, I'm very much irritated with the service.