Cancled internet a month ago but have a upcoming payment

Good morning user_3mqszh. Thank you for reaching out to us on our Xfinity Forum for help with the future balance that is showing in the app. I'm sorry that it's confusing, I have trouble with it as well since the statements are processed in advance. No fear, we can help, and I will make sure there are no issues. 

What I am picturing happened is that the account change is taking place in the middle of a billing cycle and with the service cancellation starting today that is when the system will show that the services have ended and the account will be prorated. 

Instead of guessing at the date and such, Please send us a direct message with your name and service address. From there we will have to verify the account, but can dig into the nitty gritty of it all and make sure everything is accurate. 

To send a direct message, please click on the chat icon in the top-right corner of the screen, and select "Xfinity Support" to initiate a live chat. 
Click "Sign In" if necessary
Click the "direct messaging" icon or https://comca.st/3J0ir1l
Click the "New message" (pencil and paper) icon
Type "Xfinity Support" in the "To:" line and select "Xfinity Support" from the drop-down list which appears. The "Xfinity Support" graphic replaces the "To:" line
Type your message in the text area near the bottom of the window
Press Enter to send it

@user_3mqszh thank you for sending the direct message, I'll follow up with you there to continue with the account review/correction. 

Thanks again for giving our team the chance to address this for you, @user_3mqszh! It looks like we've answered all your questions regarding the final balance and refund due to proration, but please don't hesitate to create a new post should any other concerns arise, and we'll always be here to support you and your household :)