There really are services providers for every chore these days, whether it be grocery shopping, laundromat retrieval or even cable subscription cancellation. Getting on the phone with a Comcast representative is never enjoyable; they have employees who are specifically trained on how to keep customers on the phone and rope them back into unwanted "deals." However, 'Airpaper' exists specifically to make this dreaded phone on your behalf, for the worthwhile cost of just $5.
In order to do this, Airpaper needs your name, phone number, address and account number -- if all of that is in order then your cable subscription cancellation will be completed in a jiffy. While it promises not to use this personal information for any other reason, it's possible this may be a risky exchange. However, depending on how precious your time (and sanity) is, the risk could be worth avoiding that awful phone call.