Worst Service Ever - Exciting Experience Gone wrong

Buying a new car is meant to be an exciting experience right? NOT quite. I have never in my life been messed around so much by a company. On collection of my vehicle, nothing was in order. They pull out documentation for me to sign and I see the amount has gone up from the original OTP that I signed, I asked why, and no one could really answer my questions, I was then put on a call to a manager Allan, he advised that they cannot remove these extra products which are added on and i must not worry as my installment wont change. So I continued to go through the paper work before signing. They then went to evaluate my vehicle which they advised that I was getting R75 000.00 for. He came back to me and advised that they could only give me R70 000.00. I was not going to accept this as this was not the arrangement and told them to keep their vehicle. All of a sudden I got told to hang on, let them chat to the manager again, which they did. They came back and said that R75 000.00 was fine. Just shows you how they try to take you for a ride. I then went to the FNI to start signing documentation. I asked her about the 2 extra added products and if they are a must, she advised that they NOT. Taking me for a ride again I see?? Either that or people in the company have no idea what they are doing. Whilst in with Brilliant the FNI lady, my sales consultant Otsile walked in trying to see what was happening, when Brilliant quite rudely asked him to remove himself. I think that is very unprofessional as he was just trying to see what the hold up was. Let me not forget in my 2 hours of being there I moved to 3 different desks each about twice. Apparently the vehicle also went for Road worthy but when leaving the property my mother and I noticed that the L/F headlight was not working??? Surely this would of been picked up at Road worthy. I have now brought this to there attention and they want me to return the vehicle which is a massive inconvenience and I will NOT take it back. I have been requesting the roadworthy report since yesterday, and I am currently still waiting and its nearly another day gone. Urgency definitely not on the top of there list. I also have a wire in my bonnet just lying around loose. I have asked what this is for and have not had any feedback. I would very much like for this to be escalated as I think a big company like this should have better service standards. I think its absolutely shocking that an exciting experiencing like this can turn into such an upsetting experience.