problematic vehicle

From day 1 i have been having a problem with williams hunt dealership used cars. i picked my car up on the 21ST of February 2015 and i have sent it back to them numerous of times first it was because they forgot to tighten the wheel nuts and my rim got buckled second it was the airbag light kept on flashing i went to them like 6 times for the same problem and uptill this day it still hasnt been resolved i feel that the service from this dealership is pathetic glen whyte the manager didnt even help much!zamo vilane the sales consultant hasnt even given me my service book or manual for my car ! Reggie nagiah promised if i got there at 7am that my car would be sorted and it wasnt i ended up leaving my car over night at the work shop and when i picked the car up everything seemed like it was fixed only when i got on to the freeway and started driving the airbag lights start flashing !i have spent every day off i have from work trying since i have had the car to sort these minor problems and i am not winning !