I had an appointment for oil change that was paid ...

I had an appointment for oil change that was paid in advance. As I come out of the car at the service area, I am greeted by an employee that was working at one of those movable desks. He confirms my appointment and I assumed that he checked me in, as it normally happens when I go for service. The man never mentioned anything about me checking in again inside, so I tell him that I will leave the keys in the car and I go inside. Long story short, after 50 minutes of waiting, nothing has been done to my car. The man was very inconsiderate, to say the least. It didn't cross his mind to apologize. I hope I can take the car to another Nissan service, since it's already paid.