Dynata interview questions

So 12:50pm was my interview appointment time. I received a call and I answered but no one was saying anything on the other end. I hung up and called back. It was an automated messaging system that gave me another number to call if I wanted to speak with someone. I call that number and no live person, just another automated system that prompts me to leave a voicemail. I left a voicemail, emailed the company and the person who was supposed to conduct my interview emails me back with a number to call to “address my concerns.” Already extremely put off by the fact that my interviewer doesn’t decide to just call because THEY’RE the one who’s supposed to be doing my interview, but still I call the number they give me. No one answers and I couldn’t leave a voicemail since their mailbox was full. I emailed the person back and told them no one answered and I couldn’t leave a voicemail because the mailbox was full. They did not reply. No one ever called me back. Seriously, don’t even waste your time. They’re extremely unprofessional and unorganized.