I remember this case back then. The mistake you made was to keep in denial about some issues until you got the negative feedback. Had you acted proactively in removing all the copied content or even contacting the owners of bustadice about permission to use the code, maybe things could have gone differently.

Right now, the only people who can remove the negative feedback are those that left it to your profile. Some forgive, others don't.
I don't know if you had apologized to them right after the incident, but if you did, and they didn't respond. Then you are going to have to focus on your casino and give them time to see if they can have a change in their opinion about your business in the future.