Ranked Wins Stuck at 499? Check Your Arena Rewards
Some players have been struggling to get their 500th win for a specific class since the last patch and it would appear that it's an issue with pending Arena rewards. Most notably, this happened to Disguised Toast on stream as he was finishing off his 500th win for Warrior. Here's how you fix the issue:
Quote from Aelathera
For those that are still affected, could you enter into Arena and make sure there is no reward pending on that screen then try to get that 500th win?
So if this wasn't working for you, there's the fix! Go open up your pending arena rewards and then win another game.