Cancel Service Problems

Hello-

i called Xfinity a couple of weeks ago to cancel my account effective on Oct 16 as I was moving out of state. I was speaking to AI person but they did confirm on the phone the date and provided me a reference number. But since it was AI I called back a day or two later and this time got a real person and they verified the cancellation would be effective Oct 16. Fast forward to today and I received another bill with billing date of Oct 17 from Xfinity for future dates of service from Oct 24-Nov 23. I called back to explain my cancellation should have already been processed and that I received a cancellation confirmation number previously but this person (unclear if AI or not, but I think AI) said the cancellation was in pending status not sure what that means. I explained to this person I already had cancelled and I should receive a prorated credit for days I had already paid from the previous bill (Oct 16-Oct 23) but then cancelled and I shouldn’t be billed for future dates. I received another cancellation confirmation number over the phone and a ECM number for the refund request. Disappointing and not right that it takes 3 separate calls to attempt to cancel and I am still not confident my cancellation has been processed with the necessary refund. Please advise what else I need to do to ensure the cancellation I have requested multiple times now has been processed. I have already returned my equipment today as well.