ZL Technologies Software Engineer interview questions

The Interview was an online link and provides some quick answer questions. The questions are like GRE math and vocabulary questions, and there is a phone call interview afterwards about experience.

The inrerview was scheduled for 3PM. I was asked to be there by 2:45. I reached at 2:30 and was told that team went for lunch. I was told it would be 3:30, not 3. I waited till 3:35 but they did not return. I asked the receptionist to call them but she said no one picked up. She said they went for team lunch so it may be delayed further. I left. This is, by far, the most unprofessional interview I have been to.