POOR SERVICE DELIVERY!!!!!!!

Bought Mazda 3 2 months back it had scratches, some minor dents and a weird sound when braking while reversing. Reported this a week after I bought it and they told me not to worry as they are liable of repairing all issues reported within a month of purchase. They took the car for one week claiming to repair it but to my surprise it car came back the same, still has the weird sound while reversing and they told me its because it was parked for long and still has dents and scratches nothing was done to it. I am so disappointed by Nash Nissan Alberton....they were so quick to sell the car and yet they cant satisfy their clients. Till this day the car still has a very embarrassing sound while reversing.