Zendesk Team Lead, Data and Analytics interview questions

I underwent 4 stages of the process, first was with the Talent Acquisition Officer, 2nd with the Hiring Manager, 3rd was the case study and 4th was the presentation. Everything was fine until the case study presentation, I prepared a lot but it was useless as they were looking for an answer to something they themselves, who are familiar with the business and the data, haven't done yet.