Account Cancellation - Comcast Did Not Process

Running out of places to try and get this done, so I'm trying here. I called in on February 4th to cancel my Xfinity account, effective immediately, and received a ticket number for the cancellation.

This morning, February 8th at 12:12 AM Eastern, I recevied an email saying I have a new bill due 2/27/2021 when my account should be cancelled.

What can be done to resolve this?