Bad Service and Bad attitude

I booked the car in 10 August, on the same day the vehicle was used to go to Build-it without my permission. They said the car will take 7days to repair. The car was only ready for collection on 26 August(12 working days), but the front tow cover was not there and the sticker on the bonnet was not done. In this time I called them numerous times but getting a call back was rare. They promised to get these and call us to bring the car when they have the parts. I called them on 15 September because they never called me, they said they have the tow cover and will get the sticker I must bring the vehicle in on the 20th. When I got there this morning I asked if the car can be ready at 12:00 and they said they will try depending on the technician. When I called at 10:00 to see if they will be ready at 12:00 I was told the sticker is not sold by Chevrolet,