Dependable Global Solutions interview questions

My recruiter was awesome. For the interview I spoke with the recruiter and was suppposed to speak to the government lead but spoke to the PM and was approved based on my resume. In the end after recieved my offer letter. They reniged citing being denied for clearance. At the time, I was active duty and holding a Top secret clearance. I asked for more information or to speak with their FSO and was never answer. Later I called OPM and was told that they never recieved an investigation. I asked for reason for denial code from DGS and was never acknowledge the took me out not candidacy with now valid and subsantial reason. They extremely unprofessional and I believe discriminatory. I don't know who made the decision but having signed an offer letter I believe that was the height of discrimination.