The guy at the front desk seemed annoyed that I walked in service. He barely looked up. He handed me a paper and took my keys never telling me I would need to give him the paper upon picking up my car

I took my 2021 Kia Forte car that takes 4.2 liters of oil and they put 4.6 liters in. I went to complain. They didn't pay attention to me. They simply said it was fine and left, leaving me talking to