Intercontinental Exchange interview questions

Interview was split into two sections First half an hour was an informal chat explaining the role Second half was held with HR going through CV and answering role specific questions in relation to my CV

Got a message on linkdin recruiter requesting me if i am interested in a position to be considered. I replied yes. Then he sent me two questions to give solutions to. Solutions were complex enough as he also asked to write test cases and consider the assumptions he specified. I took my time around 6 hrs and gave him the solutions in really peak times. He wanted the solutions at earliest. After this, i got email from them saying, would like to schedule a call interview. (Apparently, solutions were satisfying). Then he asked me to apply officially to their posting and sent me the link. I spent another 30 mins filling up all details. And, morning i got email saying, i am not considered for the position because of my qualifications. (I have grad degree and not only undergrad in IT). If i am not qualified on the first hand, why the hell you asked me to spend 6-7 hrs of my time solving your problems? Advise to H1 folks: if employer doesn't ask if you need sponsorship, better you ask them before spending any time giving the assessments.