mile high car company sold me a lemon for a car colorado springs, Colorado

I bought a car from mile high in Feb 2011 3 days after buying it i had a complete brake job done since the brakes were metal to metal.  A few months later the window motor went in the drivers side window. paid 250.00 for that then the alternator went which was 450.00 to replace. Shortly after all that service engine soon light comes on, 200.00 to get ground connections cleaned and tighted. a week later sevice engine soon light comes back on 235.00 for CAM sensor. I feel that they took advantage of a single woman looking to buy a car. I went in to see what they could do and they saw me coming boy... i will never ever go back there or send someone there to buy a car. Also, they took me car as a trade in , it had a piston rod knocking in the engine, and they sold it without ever getting it fixed. How do you get away with selling cars without ever fixing them first? Mainly when it becomes a safety issue, like brakes being metal to metal. I told them this is obvisiouly not my fault with the brakes seeing as i only had the car for 3 days.