Disappointing Service (undermining consumers)

I Picked up my car yesterday from the branch and first I want to state that I haven't got such the worse service ever in my life and with people who are intentionally doing things to show that they are undermining you.

My car went for an engine change as per the specified first complaint which they then chose to ignore in any way and of which I haven't event gotten some form of apology or anything like that, or rather an explanation as to why they were careless on their end?

1. when I went to pick up the car it was filthy and they can even agree to it when showed them the condition of the car and they then suggested that they will quickly wash it but due to time I told them that this was supposed to be done yesterday since I was notified by then that it was ready, but instead I was treated like a fool from that place which took the monies owed to them but gave me the worse service.

2. The car tank was empty and when I raised it up was told that they didn't use it for long and I brought the car with petrol in and was enough and to top it off I also brought back the loaned car with more than 200km worth of petrol that I put in with my own money, which when they loaned me I almost got stuck 1km away from them due to the car being empty. when I raised that point I was told that the car was empty and they can only put in 150 rands worth of petrol only I then decided to just let it go due to the attitude that I got from them.

3. The car was not fully done with the service every time I start the engine it tells me that "Oil change is required" that's the same day from picking it up from the workshop, when I called to speak to the of the consultants I was told that they only take calls after 9am but the business working hours says 8am. they then changed their mind to put me through to whoever I was supposed to speak to after I asked to speak to someone who deals with clients satisfaction and was told that it was just a mechanical reset then my question was WHY DID THEY GIVE ME A CAR WHICH IS NOT FULLY FINISHED? was told that it is nothing major.

4. They chipped my windscreen and said nothing about it, was as if nothing happened.

5. I thank God that I went to a garage and asked for my wheels to be checked and asked them to check all of them, apparently the left front wheel was filled up to 460 for 240 car and the other one was at 260 and the question here is did they do this to perfection or was just to get rid of me so that I can come back next time and be treated like some fool?

I am extremely disappointed by their service.