Peachy Free Trial Cannot Be Cancelled Before Automatic Billing

I recently started a free trial for a Peachy subscription through the Apple App Store on June 12. When I tried to cancel the free trial, the system informed me that I could not do so and did not allow me to proceed with the cancellation. I am concerned that this situation may lead to an unwanted paid subscription when the free trial ends. I request that my Peachy free trial be canceled as soon as possible and that no charges be made to my account after the trial period. I also kindly ask for written confirmation that my subscription has been canceled and that I will not be billed.