No Premium Features Available . Not able to cancel after trial .

The Premium feature buy stated that I will be changed after a 3-Day trial period . I purchased it on 23-5-2021 and got charged immediately . I couldn't see any of the features ( 4K export , Audio Export , Motion Effects ) even after troubleshooting ( reinstalling the app , re-login , force close ) . So I decided to end within my trial - TODAY ( as i didn't get the features as promised ) . Google Play doesn't refund even though am in my trial .