CAR IN A POOR CONDITION

I have never been so disappointed in my life, i was so patient with the salesman as he was performing his duties by taking the car to 101 for inspection and fixing the mechanical problem that was detected in that car. Less did i know that i was just wasting my time and money by paying out the deposit and applying for finance, right now am in the house stressing about my car, i didn't even manage to make it to the wedding today because this new car that i collect from we buy cars midstream decided to disappoint me before i even arrive at home yesterday. Why was i given the car that was not in a good condition? What have i done to derseve such a service after paying so much money to get that car? Am very disappointed and hurt indeed. Can i please get further assistance i really need to use my car!!