Ongoing Billing After Service Cancellation

I canceled my service via phone and my service was disconnected right after the call. I can still access Xfinity app and don't even see any plan.

Thank you so much for the clarification. Let's take a look at the account for you.

Please send us a direct chat message with your full name and complete service address to “Xfinity Support”. To do so, click on the chat icon located at the top right of this forums page.
Here's the detailed steps to direct message us: 
 • Click "Sign In" if necessary
 • Click the "Direct Message” icon (upper right corner of this page)
 • Click the "New message" (pencil and paper) icon
 • Type "Xfinity Support" in the to line and select "Xfinity Support" from the drop-down list
 • Type your message in the text area near the bottom of the window
 • Press Enter to send your message

Let me know if you have any questions.