Tummoc interview questions

The HR intern had contacted via linkedin and asked to complete an assignment which was a red flag, usually all HRs complete one round of interview. I reached out to him and called him to ask about the company in which he said Tummoc can be searched online and you'll get all the details. Every company can be searched online and I wanted to know the perks of joining Tummoc but this was a bad experience too. Later I completed my assignment and I submitted and for 4 days there was no response and my file wasn't even visited. I had asked the hr multiple times and he asked me not to call him or text him, this is the worst interview experience I have ever had, I don't know any HR that would treat any candidate, the company must know that any person with a high school education can do the interns job or maybe a better job. Later when I emailed other HRs and this person, there have been no response which prompted me to add my experience to this platform, I think the company stole my designs and my ideas and I want other candidates not to waste their time and effort. Thank you!