My suggestions is that you include the exit paperwork with the HR representative's signature as an exhibit in your appeal. You should state that this is new evidence of untruthfulness that was not considered by the hearing officer. You should also emphasize that you were forced out due to a hostile environment and give specifics of how they were hostile to you and forced you out and that you did not quit. It may also be good for an attorney to review your appeal before you file it.
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This is not intended to be legal advice, but is only for general information. Cantact an attorney in your area for legal advice.