Arcesium Software Engineer interview questions

Everything was going well. But as the year ended, They ended the hiring. And I received an automated email saying you are not selected. First round - Online coding test on hackerrank. There were 3 questions, 2 medium and 1 hard. I was able to clear this round with 2.5 questions solved Sent an email to HR for the update on this round. No response, But got a interview schedule after 1 week. Second round - Technical Interview where interviewer asked about my previous experience and 2 DS questions. I solved all of them and I cleared this round also. Sent an email to HR for the update on this round. No response, But got another interview schedule after 1 week. Third round - Technical Interview happened on last day of year and till now bulk hiring was happening. Interviewer asked about my previous experience and project I worked on and asks some questions based on that. After this he gave me 1 DS question for which I give a correct solution and provided with a working code with examples to dry run and I did an explanation of dry run with interviewer for better understanding. Sent an email to HR for the update on this round. No response at all After this when office reopened in new year I got an automated email in the morning saying you are not selected. When I asked HR for feedback of positive and negative points they are not replying again. During this process, HR never used to respond back to my emails even during the process. I had to write multiple follow up emails. Advice: Don't waste candidates time when you don't want to hire them for no reason. Or even if it is genuine reason for a rejection then provide a feedback so that candidate can prepare for it.