Capgemini Software Engineer interview questions

attended walk in interview on 2nd jun at kalyani ngar pune. in mail they mention reporting time till 3pm. we reached by 1pm but still they didn't consider us and rudely told that 100 registrations are done so we not take more entries. If this is walk in interview then how there is limitation on entries. If this is process then mention in mail itself please don't waste our time.