Synera .NET Developer interview questions

I had applied through online job portal to this company. Initial round was with management person, who discussed your profile, explain about the elise & salary expectations. if he has positive impression he will provide a test to complete. Long problem statement with needed solution. Basically tried to see applicants approach. once I submit the solution which was pretty good in my opinion. This company literally ghosted me. & after 2 months they sent one line rejection mail. They are unprofessional to the core for not providing the detailed explanation why they are rejecting candidate. Someone has spent sleepless nights to work on their problem statement, at least that person deserved to know what went wrong & pointers to improve upon. Another important aspect to provide a timely feedback. I mean providing feedback of the test after 2 months. I mean that just unprofessional to the lowest level. It means you don't care about your future employee & do not value their time. I have seen their same job opening from past 6-8 months. I mean what they are trying to hire with because of getting the interview is pain in the meager salary.