Kinetix Trading Solutions Java Developer interview questions

I applied through my college portal, got an online assessment. I finished the 30 minute assessment in 30 seconds(with just one line code). The HR called me up and fixed a date for on-site 20 days in advance. After that I tried reaching out multiple times to the HR, no response(email and phone). 2 days before the interview date, I called him on his personal phone number and he responded saying that they would have to change dates. Never got back to me again. Don't bother interviewing with them.