AlphaGrep Securities C++ Software Engineer interview questions

I have applied on LinkedIn. Recruiter given me assignment related to trading application development. That task need to complete within 3days. I somehow managed the time and completed it within time and submitted. But I haven't received any response from recruiter. In the task they said if any doubt then you can ask. I asked doubt then aslo no reply. Then I have messaged on LinkedIn to both recruiter of the company but no one even give a response back. I have done the assignment with lot of efforts. No value of anyone's time?