If the ref said it was a dive then why didn’t he call a diving penalty?
Start calling all the dives and make the diving team have to kill a penalty, that’s the only way you will have any chance of eliminating it. Right now there is every incentive for coaches to encourage players to embellish as it almost never gets called as a standalone penalty. You either get a power play or matching minors. With the decrease in scoring over the years, power plays have a greater impact on the outcome of games, hence a greater incentive to try and “draw” penalties.
While you’re at please start calling interference and pick plays. See too many of these go uncalled.