FAULTY CAR

I went to We Sell Cars montague gardens and bought a Hyundai i10. This car was supposed me to be a relief seeing that my old car had so many problems and I needed a break. As usual, there is no rest for the wicked. When I got the car I noticed a fault with the ignition. The key comes out while the car is still idling. So I took the car to Hyundai to get my warranty and enquired about the ignition and they diagnosed immediately, checked the part and it's the right one. Went back this morning to have it installed and the problem persisted and the agent at Hyundai said the keys need to be replaced which will cost a price that I cannot afford this time of year. This car is giving me problems and causing me to stress and I have had it for about a month. The agent who sold me the car told me it is, and I quote "100% good to go" and yet I am having problems. This problem is putting safety at risk as the immobiliser does not work as the key can be taken out the ignition and completely out the car and the car still drives and this will cause k*k with my insurance if the car is broken into or ******. Replacing both keys is going to put me in debt and I am sick of having to drive up and down and fighting with people for answers.

HELP!!!