I currently work as a technician for a major car manufacturer, and I have been offered consideration for an Engineering position, which requires a release letter from my workplace (a dealership) to be considered for that position. Initially I was told I'd get it, because I have no legally binding contract with them, then I was told I wouldn't get it with no given reason. When I presented this issue to Senior Management, I was told it was because they wanted to keep me there, and they didn't have to give me the letter. This letter would not even guarantee that I'd get the position, yet they don't seem to want me to even be considered for the position. Can they do that? If not, is there another way to obtain the letter or a similar document so I can be considered for the position?