i don't know if this works all the time or not. but i called in and said "CANCEL" and i was immediately sent to a retentions specialist. but that may have just been an accident.
i ended up getting the farm from them including free dvr, $20/mo off my bill, $150 service credit, free superfans, free hbo/showtime/cinemax/starz, etc. so he was the real deal.