Hi Stumbler! Officer Dave here to assist you with any concern you may have regarding Purchase & Billing 👮  
We apologize if there's an issue that made you request a refund, as our focus is to always provide the best experience for our dedicated players.    
Unfortunately, since Google, Apple and Steam handle all of the transactions you also need to request a refund directly from them. We are not able to give refunds directly through the Stumble Guys support.

Keep in mind that successful refund request will roll back your account resulting into loosing items you have gotten with the purchase.

Refund from Google Play Store: 
(or contact the Stumble Guys support team)

Refund from Apple AppStore:

Refund from Steam:
Refund from CodaShop:
Have a lawful day!