https://workforcesecurity.doleta.gov...onmonetary.pdf on page 5-3, and the footnote on page 5-4.
OR has regulations on this type of separation. You might very well succeed if do things right. Personally, I think you should have been denied for "quitting" rather than "refusing." You should type in the denial letter so that you're not going into your hearing presenting the wrong type of evidence for the situation you're dealing with.