Cummins interview questions

This company is the most awful company I ever had interviewed with. I had on campus interview,after that I received a call that you have advanced to the phone interview. I set up a phone interview with them. The phone interview was an hour long. They asked me technical questions, and I answered them right! as I checked my answers after that. Then I had another phone interview and was told that you are a suitable candidate. I was 100% sure that I got the job. Then they didn't call me after that. I emailed them like 10 times and no response. Then I saw the same manager in career fair again and I went to him and told him everything. He told me that they were updating the system and lost the data of the candidates.What is this? you can just loose someone's data? And when I emailed him again, he responded after a month that we are proceeding with someone's else. If you are seeking job with this company, Please don't do it! The most irresponsible, unprofessional people I know after the t-mobile company, or maybe they are both the same!