BNP Paribas Software Developer(.NET) interview questions

Interview process consists of hackerrank test if you clear the test they will call you for f2f. F2f rounds consists of 2 technical , 1 managerial and 1HR round. I have completed all the rounds till 7.30 pm. In managerial round they confirmed me as suitable profile . But HR is quite rude and non cooperative. He was neither giving a chance to talk nor agree on your thoughts and expectations. They have wasted efforts of entire day and not attending candidate came for an interview. Waiting time between each round was near about an hour. Again after clearing all the rounds , they are replying after 15 days with no proper reason of rejection.