Amazon (Business Analyst) interview questions

The interviewer called a day before the actual interview day. I am not sure that interviewers from a company like Amazon can be such careless. After calling, the interviewer started telling me about the team and what they do. After he was done telling me what the team does, he asked me if I was ready for the technical questions. I told him that the interview was supposed to happen tomorrow, not today. He said he didn't know and he will call me back tomorrow. The next day, he called me. Asked me a couple of technical and behavioral questions. I was pretty good at what he asked and tole him everything confidently. Got a reject in two days after this interview. Not sure what he was looking for.