I was asked to an interview by a marketing firm. I had been under the impression the position was for a promoting specific brand. The interview was a group interview with about 10 other people there. They likely would have hired more than 1 person for similar/identical positions. The interviewer only discussed topics in the most general of ways and gave no specific details. Each candidate was asked to describe themselves. I was surprised how no body seemed to focus their experience or skills as they would relate to the job. There were only two other questions that were equally as non-specific to a job.
I asked the interviewer if this was more of a general interview or specifically for the position promoting the certain brand. She seemed upset and gave an answer which basically amounted to "both". As I was leaving someone mentioned that the interviews for the specific role I thought I was applying to happened earlier that day. At home I double checked my emails and I definitely applied for the specific role. Some times these agencies hire/interview for non-descript positions to build their roster in anticipation of work(like how recruiters hold interviews without actually having a job opening). I think this what was going on here.
Is there anything I should do now? I would feel better if I let them know about the misunderstanding. Anything I could have done differently while at the interview? I felt like my time was wasted by attending the interview. Even though there was only 3 questions, each person taking 3 minute to answer is 1.5 hours.