Cintas Corporation review: Won't hire good men 1

So, I have filled out 6 applications and got back that "unfortunately we went with a different candidate" email. I was referred to the company by an employee and that employee talked to the GM and hiring manager, but I still got the sorry email from them. I went down there twice, and the lady manager wasn't there so I left my number but never got a call back. I called her and left 3 voicemails and still no call back. I want to know why! What was it about me or my resume that made them say we pass. I have 5 years' experience in this kind of industry and should not have been passed over! I have showed that I am interested in this company, and I find it very unprofessional that I didn't get a call back. All those position that I got passed on are still up like they didn't hire anyone yet, here I am ready work but Thay won't even call me back!