GameDuell Engineer interview questions

I was contacted by GameDuell on Linkedin. I was not available then, but get back to them a few months later. I contacted the same hr manager to check whether they have open positions. They were looking for several positions at that time. I sent my cv and made a general application. I had to wait for 3 weeks before anything noteworthy happened. They started advertising the position I was most qualified for, on the following day I applied. I guess they have a policy to not interview only one man for a position, but still was not very nice. My application was passed from one hr manager to another. I get to know 5 of them by mail, but had to wait 3 weeks for the first interview. It went well, I get a longer 3 question assignment. I had 4 days to solve it. I sent the solution on the second day. All questions had some error in them!! My application was still a general application at this moment. I didn't get a response again for 2 weeks. The hr managers didn't answer my emails. Finally I get a response form someone who I never met, that my profile does not match what they are looking for at the moment, but they liked me and suggest to apply for other positions in the company. I am still not 100% sure what was the position I got rejected. I never get a response for my solution. The mail come from a guys email account, but said it was sent by someone else!! If my profile does not match, then why did they need so much time to find this out? Never heard from them since.