SewerAI Data Engineer interview questions

Initial HR call after which the Hiring Manager round was scheduled in a week. The HR call and Hiring Manager round was moving fast. The HR reached out in 2 days to schedule the next Technical interview. On the day of Technical interview the HR informed they are pausing the interview for 2 weeks and will resume the interviews after 2 weeks. I got a rejection email after 2 weeks saying they are going ahead with another candidate without even proceeding with the interview for me and giving me the shot. My guess is they were just stringing me along to keep as a backup until the other candidate accepted the offer. Very unprofessional and a very bad experience as a candidate. Invested a lot of time and effort which was in vain.