Penske Automotive Group interview questions

I applied online and received a call back just a couple of days later. A phone interview was scheduled for the next week. This interview was pretty quick, and I was only asked like two questions. I was then scheduled for an in person interview two days later. The interviews with the sales manager was very chill. I wore a suit and tie and felt overdressed. I was asked a few standard questions. Up to this point, the process was extremely fast and easy. After the in person interview though, it took a week to get a contingency offer. I accepted, and started the background checks and drug tests. Despite doing these immediately, I didn’t hear anything back for 3-4 weeks. I reached out to the sales manager just to ask if I had been dropped from consideration since it had been so long. The whole process took just under 2 months from my application submission to my first day of work. And I submitted everything as quickly as possible.

The interview process took place over a month, with 3 interviews. Everything was fine untill I was completely ignored after my background check. I was given an off of employment with a potential start date but when I contacted HR to verify everything was okay, I was simply told my offer was "put on hold", with no explanation except to wait for a letter in the mail from the company that did the background check. The letter simply said I may be denied a position, but did not at all specify why. I called and emailed the woman that interviewed me, as well as the HR person, multiple times and have yet to get an answer on what the problem was. It's been 3 wks and I have not been told yet what happened. My drug test, criminal background, and driving records are perfectly clean, so my guess is this is based on my credit, but I CANNOT believe no one has answered me or told me anything straight out. Such an horrible and unprofessional way to treat people.