Jet interview questions

Had several phone interviews followed by an online math "quiz". I was told i had 20 mins to complete as many of the 30 test questions as I could in 20 mins self timed. I wouldn't say the questions were hard but each was intricate and didn't have a perfect answer amongst the choices. I followed the directions and worked, in order, on the quiz and completed just 5 questions in 20 mins. I was disappointed that I only got 5 done but i followed directions. I emailed the person as directed when complete. I followed up with several emails and several phone calls to each of the contacts that I had but received no response to anything. After a month of following up i assumed they weren't interested.