Paidy API Engineering interview questions

When I submitted my application, I was given a written test and told to complete it and submit it to them later. I also asked a question about relocate in an email, which was not answered. I completed the written test the same day and I thought my answers were correct and of good quality. Two weeks later, they told me that I did not pass the interview given my "background, abilities and skills", with no explanation and no feedback.