The Waterworks interview questions

The interview consisted of two sessions, each about 30 minutes in length. The interviewers were pleasant and asked typical questions for the most part. One question was quite vague and when I asked for the interviewer to elaborate/clarify, they did not do much to guide me. Additionally, I was told I would hear back with a decision and was never contacted. Even after following up with both interviewers post interview. This is very unprofessional and the industry standard is to let people know, even if it's a rejection.