Diffusely Business Developer interview questions

First i was called by the HR, he was very friendly and explained everything that was needed. Then he scheduled a meeting with the manager of the department. Here is when things start to be weird. When I arrived, the manager did not know about the interview, he never saw my CV and did not even bother to pretend that he was interested. I prepared a lot for the interview. After less than 5 mins, he decided to ask someone else to do the interview, for a position that I did not even apply for. Of course the guy was not prepared neither. It is super disrespectful to treat candidates in that way. Did not even get an email to say yes or no, in any case it was not the environment I would have wanted to be in.