Disappointed by city motors Pietermaritzburg

I went to city motors at Pietermaritzburg to trade in my car. They told me something about the shortfall and stuff and that it can't be traded in but they can look for someone to takeover my car and continue with the installment and they told me that I don't qualify for the car I wanted because it was some kind of a downgrade so I should take the other one and like any salesman they convinced me to take the car and told me all about the advantages and disadvantages of the new and the old one and I understood. But to my surprise they told me that I will get the service book and the spare key on Monday because it was late and they will give them to the salesman who sent me there as he was not there on that day. When I entered the car oh first ofall it had registration and I asked about it and they told me that when the cars are fetched need to have it and bla bla bla. OK. It was already late I signed the paperwork and when I got in the car and started the car it says 6000km I asked them how come because we were talking about a new car and they say it's a demo of which when they showed me the car and explained everything they didn't tell me that. I drove off. Days pass by and there was no one telling me anything about the service book and spare key I told the salesman but he said nothing I only received an sms after few days from the person who was assisting me telling me that they have found someone to take over my car I should call him so that we talk. I asked him how come because they said they were going to call me to finalize paperwork for the takeover. He said I should do an affidavit and send it to him. No spare key and service book for the car I'm having now. The car had6000km but guess what it has a problem with the Tyres. As I was driving on the 22nd Dec (yesterday) the car told me that I had to check the front Tyre I went to the garage and thought maybe I had puncture but no it still says the same thing and I changed the Tyre and put on a spare wheel but still it says the same thing about the Tyre. I guess it needs an alignment I don't know and I'm asking myself how because the car is not even 10000km. I think I've been robbed it's not even a month asnd I'm not a traveller for heaven's sake. I think I don't need this car anymore and I called the guy with my car he said we should meet after Xmas and I think they should take back their car and give me back my car they are not to be trusted anymore. I'm so disappointed by this Tyre. It means I'm not safe.