payed for monthly streak and never received rewards

Hi Kostaricaaa​ , and thank you for reporting this issue. I’ll flag it with the team.

Update: May I also ask whether Apple has already issued a refund for that transaction?

For Apple purchases, it usually takes up to 48 hours for the refund to be completed. In the meantime, please allow some time for the automatic refund to process. If nothing happens after 48 hours, you can submit a refund request directly on their website.