Discord server boost refund problem

Today, I did boost one of my server with 1x Boost (not Nitro) and then I realized that the Discord Nitro Classic is much better than 1x server boost, so then I tried to cancel my subscription, automatically redirected me to Google Play Store to cancel my subscription. And I'm wondering why didn't I get a refund. I want to get my refund and subscribe to Nitro Classic instead. Do I have to wait for a month to get my refund? Because it says that I am able to refund 5 days after purchasing...