Bad service and hidden costs

I bought a Kia Pcanto from them on Saturday first of all the service was not very nice at all the sales person was okay he informed me that the other person will explain everything to me about the car when I go make the payment, we then went to this person's office we were not informed about anything he asked questions about if we want a motor plan stuff that is extra costs, we said no we gave him all the info that he needed then came time to pay he gave me an amount of R4950.00 more of what the price of the car was, I paid cash for this car so I was not expected to pay extra's and no one informed us about it, I asked what it's for and I was told it's for license registration and AA check and who knows what else, I also left there with the car and no proof what so ever that i bought the car i can also not add it on my insurance because i have no proof that i bought it, and now they are coming to fetch the car for the checks on Wednesday what if something happens to the car who will take responsibility for it if something happens? The car also have stone chips on the bonnet that i didn't see and was not informed off there is also scratched marks on the left back weel flap, We bought another car for my husband 2weks ago at a general car garage and we had so much better service as what we got from Kia, they did the license and registration at no extra cost we even got a discount for cash, I was really shocked when i was informed to pay R5000 extra is this stuff not supposed to be sorted out before they sell the car, what if something comes up on the AA check and i have already bought the car how is it my problem as a customer to pay for all of this, they should tell customers about the extra amounts you have to pay and the car have 600 kilos more on the clock than what was advertised, i drove the car home that is 10 kilos and the salesman took the car to put petrol in that is 2 kilos so what happened to the other 600 kilo's ? ad alos this car is a 2023 model its suppose to get a 3 year service plan or 3 free services I was told i get one service in September that's all, the car only had one service as from the service book, I asked if the garage give you some warranty, the sales person said the other guy will explain, as from what I understand from the forms I had to sign you get nothing if you don't pay for it, I had to sign that I said no i don't want a motor plan and whatever else, because that is extra costs again, I am so dissapointed in the service I received