PurpleTalk interview questions

I was called for Interview without telling me the experience they are looking for. As soon as I came, the HR himself decides that I am not fit for the position without any technical knowledge or further Interview rounds. My work experience has correctly matched with the requirement. They asked me to come after a week after Learning AngularJs. Now tell me why a business analyst would learn AngularJs? They could have hired a developer for AngularJs instead. After number of follow ups HR informs me that the positions are filled. And the person who asked me to come after 1 week never picked up the call. The HR needs to be streamlined and please set a proper expectation at the initial stages itself.