GLG interview questions

1st stage was a brief and casual call with HR, that was fine and the lady was warm and supportive, running me through what to expect in the process. Next stage was a 1 hour competency based interview with a Manager, again, all fine and no complaints. Next stage was 2 hour case study session with another manager-straightforward enough, you take a mock brief for a project, again I thought this went well, feedback was good on the shortlist I provided to her. Then.... NOTHING! After investing around 4-5 hours on the process, they never got back to me? I emailed once to chase the HR contact and still nothing. So rude and inconsiderate. Still haven't heard....