Social Construct Software Engineer Full Stack interview questions

During the initial phone screen they asked me questions about my experience and briefly explained the role. They then invited me to do a coding challenge with a week to complete it. I completed it in a few days and submitted it online. I followed up to confirm they received my submission but they never responded. I followed up 3 times, but I never received a response. After spending several hours on their coding challenge, I was shocked that they couldn't take 2 minutes to reply to my email. I am very disappointed in their unprofessional behavior.