Docuplex IOS Developer interview questions

It's a startup with tech team size of 8-10 people, HR told on call that they will conduct all the rounds at the same day. First round was kind of screening oops concept, fibonacii series and stuff. HR very casually said that next panel is not available and they will call. Dropped her emails about the result of first round, but no reply. Called them up and they said you didn't fit the role and when I confronted her about the mails I dropped, she clearly denied of getting any mail from me. HIGHLY UNPROFESSIONAL.