Barclays Android Developer interview questions

Firstly recruiter call and some take home assessment with culture fit questions, then one hour tech screen round. For which they scheduled the call and on the date of interview no one came to the interview I waited for 30 mins emailed everyone but no response, later they said to reschedule it. I had interview to which I gave answers really well for all android related questions they asked me. 2 days later they just gave me a generic rejection email with no reason.