PS/ Unfortunately, we can’t share our professional conversation with you because it is confidential and related to our business.
Our open case focuses only on the behavior and the overall situation with the concerned person.
Thanks again!
You have the right not to share any conversations related to the contest case. After all, that is how you work professionally with your coworkers.
But when the case is more serious, you may have to share some evidence related to the irregularities committed by your contest manager. If you don't want to share it, the case should be resolved by the settlement you should have reached with your contest manager.
I don't know why you chose a different contest manager when, if I'm not mistaken, you already worked with another manager to handle your previous campaigns.