Liberty Excavators interview questions

They contacted me for a interview which turned out very well. Took a road test which again turned out well. They even sent me a letter of intent on what they were offering me job / benefits after the interview and road test. Went for the DOT/Campany physical which I was told by the Examiner also went well. I was even issued a DOT medical card (so definitely passed DOT physical). The next day when I called to find out about a start date I was told the company was declining to hire me. When asked why and if it was something that could be rectified I was told no more information could be or would be given good luck in my search. That was after using my PTO in they're interviewing process. You would think I would have had at least deserve some type of answer or explanation.