Dear User, sorry to hear you are seeking a refund.
May you give our Premium features another chance? They are designed to help you reach your goal faster. Also you can stop your subscription anytime you want.
However, to proceed with getting a refund, please contact Apple/Google Support directly. You are eligible for a refund within 90 days (iOS) and 48 hours (Android) since the moment of purchase.
Should you have any questions, just use in-app Help Center (in Profile settings) or email@example.com.