Datadog Front End Developer interview questions

I received the phone call for my initial phone screen interview. However, after I answered, DataDog immediately hung up. I tried calling back but only got the system. I sent 3 follow-up emails, including one that cc'ed the director of the group but got no response. My theory: the interviewer reviewed my resume as he was calling me. Upon seeing some disqualification (likely, that I was a recent graduate of a bootcamp), he hung up, concluding that no explanatory message was necessary. I understand that the company has its rules, as it should. However, the callousness with which the HR rep dealt with this situation is sickening. And unbecoming of a successful start-up.