can you show me proof
You are not going to get proof here in public buddy. Casinos doesn't such data;
1. To avoid getting into legal trouble regarding user data privacy
2. To avoid showing the multi-accounters how they detect their multiple accounts so that the culprits may use that knowledge circumvent the detections next time.
If you want to dispute, try third party mediators but if you know that you are guilty, then don't even bother wasting time.