Although I'm sad to hear that you'd like to cancel your QuickBooks Self-Employed account, I want to ensure that you have the steps to do so and aren't charged for it any longer. Cancelling your account is something that you can do directly in QuickBooks or through your mobile app store if that's how you signed up. I can help with this.
As I just hinted at, there are two ways to be subscribed to QuickBooks Self-Employed: directly through Intuit or via a mobile app store. How you signed up will change the way you approach cancelling the account, but in both scenarios, you can take care of it yourself. Our article Cancel your QuickBooks Self-Employed subscription has the steps you can take to end your subscription of the program.
That should get you on your way, but don't hesitate to reach out again if you need an extra hand.