Comcast refuses to issue a credit for an over-billing mistake

I recently performed an audit of all my utility bills and found that Comcast has been over-billing me for 10 months – specifically for cable service that had been cancelled and the cable box returned to a local Comcast office.

When I contacted Comcast customer service, the representative acknowledged the mistake, but told me she would not receive a full credit because they couldn't verify that I wasn't watching basic cable during those ten months.

This is unacceptable as I formally requested a cancellation, that cancellation was verified by Comcast customer service, and the equipment was returned. My responsibility was fulfilled, and the expectation was set, therefore no longer making me responsible for those charges.

I agree that I should have audited my cable bill sooner (an oversight resultant from a combination of automatic bill-pay, me managing my household utilities, and my wife paying all the bills). Regardless, I am not responsible for Comcast failing to follow-through.

Please help.