Redbrick Offices interview questions

I was contacted by an agent and the interview process happened really quick. Mr. Ayush Goenka himself interviewed me and was very impressed. However, things took a turn when he called me to the other office for a drafting test. After 5 hours and a 44 pager wherein the company completely exploited my services without any payment whatsoever, the company refused to hire me after giving me sky high hopes for about 3 months. I later discovered that there were 2 more candidates who were fooled in the exact same way only to get some work out of professionals without the payment of any fee. I'm extremely disappointed and put another offer down because of their false hopes.