Hey all,
i finished last season as a diamond, but got no revards (comp points and title). I see in profile that i am still diamond, so its not about lowering, i have not played since i got diamond. I really want to get my deserved title 
I hope Blizz will fix that.
Cheers,
limp
You are not alone in experiencing this bug. Here’s a link to my post in case you’d like to read more about this issue: Comprehensive Thread Of All Top 500/Competitive Bugs. I’ve compiled a list of posts regarding similar bugs under: Incorrect End Of Season Competitive Rank And Rewards (Seasons 1-3). Please help in spreading the word about this megathread and other related threads, we must demand the Developers to give us the rewards we rightfully earned.
we all hope that Blizzard will not just ignore this amount of reports about rewards and fix that asap…