Would have been better if we're given the car on time and explanation for not getting the same car

We booked the car to start rental at 9am, we were there at around 8:35 to prevent delay, completed all documentation at around 8:45am, was told that the rental will start at 8:30am since we were early, however i felt unfair so i requested to start at 9am instead, the lady who served us said we will have to wait until 9am. So i agreed and thought they will hand us the key at around 8:50am and go through the car with us so we can leave on time. However we were only served at 9:00am, by the time we got the car was way past 9am. Also during the waiting time, I realized my flight print out and other documents were mis-handed to the lady while making payment. When i walked to the counter and asked if my document was with her, the lady was quite rude and asked me to wait for my turn. We were not given Volkswagen Polo as booked on Easyrentcars.com. No explanation given as well. The man who served us for the car return had better attitude.