Sonar Communications Manager interview questions

I had two interviews at Sonar over two and a half weeks. The first was with the hiring manager, and the second was a technical interview. The interview was slightly awkward as it seemed the hiring manager didn't have much experience interviewing candidates, they never asked follow up questions and never shared insight on what to expect in the rest of the interview process. It took them two weeks to find time to schedule the following technical interview. I was asked to complete an extensive case study in one hour and present it back to a group of 3. The next day I was informed I wasn't moving on in the process, the recruiter didn't even reference the correct job in the email. I asked for feedback and was told my feedback was positive, that's it. I asked again for specific feedback considering I completed a lengthy assignment for them and was ghosted. The whole process was unprofessional and a waste of time.