Frustrated with credits never showing up that Comcast reps had agreed to apply, and the subsequent reps saying he had no proof a deal was struck, Marc Pachtman launched a crusade of sorts. The biggest problem is that no rep would ever send him written confirmation. So he complained to the FCC, his local Congressman, and the CEO of Comcast. He got this letter back, which you yourself can use to demand written confirmations from Comcast reps:

December 10, 2009

Dear Mr. Pachtman,

Please accept my apology on behalf of Comcast Cable for the inconvenience you
experienced related to your cable service.

As discussed, if you contact customer service regarding a promotional offer any representative should be able to contact their immediate supervisor or manager to provide written confirmation of the promotional offer.

Thank you for contacting our executive office with your questions and concerns. We at Comcast strive to offer 100% customer satisfaction.

If you have any questions or concerns please contact me at (302) 504-9002 (Monday-
Friday, 7:00 a.m. to 3:30 p.m.)

Sincerely,

Yvette Loftin
Comcast PA-DE Regional Executive Office

Why You Can Get Written Confirmation From Comcast Now [NYT Bucks Blog]

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