Applied for the Mobile engineer - android, but the HR asked about Objective C and Swift (Which doesn't mention in the job requirements). I answered I don't know them but I am proficient in Java and android. Asked about visa and relocation. That's it, HR call is over. Before the interview, I prepared about the company, role, projects but nothing has been asked. I felt very bad after the interview. Got rejected after 2days. In the same call, I need to be interviewed for the other role Full-Stack engineer too (other HR from the same company contacted me and asked me whether I am ok to take the same call for 2 positions), I reminded the interviewer about that, but the response I got "That is also done, I will inform her". She didn't ask any questions related to both positions. How do they reject based on this?