M-DAQ Senior Software Engineer interview questions

It was in person about 3 hours long interview at their office. 2 hours technical interview and 1 hour HR and manager interview. The interview was positive and recruiter told that I passed it and will get an offer within few days. However its been more than 1 month now and they never got back. It is ok not to get an offer, but at least they should give a feedback and update potential candidates about the outcome. I applied 1 day leave and went to their office to attend the interview. Despite it was very positive one, they never bothered to get back. Very unprofessional.