Hi there,

Have you entered Arena since the start of the new season? If not then try going into Arena and you should then receive your rewards via in game mail... :)

Hi,

So you received it before the 3/6/17 but didn't claim the rewards and it has now been deleted by the system?

Hi There,

I apologize for the delayed response... :)

The system will also auto delete mail when your inbox is full and you receive new mail even if the rewards haven't been claimed... In future I would suggest claiming your rewards sooner... :)