I want to cancel my subscription to Smule App

I have the Smule app and I thought that my subscription was for just one month at $20. But the subscription renewed and charged me another $20. I didn’t know it was going to do that. I want my money back and I want to cancel my subscription. I went into settings to cancel and there is no option to cancel it. I requested a refund. I really want my money back and want the subscription cancelled. Please

[Re-Titled by Moderator]