Tesco Customer Service Associate interview questions

I applied for a position in Ballincollig in Cork. I completed the online quiz and about a week or two later I got a call inviting me for an interview. The interview itself was very simple, the questions were very standard. However, I arrived at my interview about 10 minutes early and the interviewer was 15-20 minutes late. I was told I would have received notice whether or not I would have gotten the job the following Monday. It has been nearly a week since and I have still not received any notice. I found this to be very unprofessional.