Missing arena promotion rewards

Hey.

Using this account to create thread as can’t seem to create topic on the account where it happened. Server 9

Anyways. On my s9 account I just got promoted to platinum in arena but received no rewards. As I have with every other promotion. (Diamonds)

It’s the first time in platinum on this account. Haven’t been demoted ever.

Thought I’d ask here to any reasons why this happened before I contact support.
As to hopefully get an answer instead of clogging up tickets.
Desperate for the diamonds to get stamina deal! And I definitely didn’t receive them.