Cablevision upgraded me to their IO Digital Cable Service in July 2005. They came and replaced my analog set-top box with a digital box. I did not check my bills closely enough for the following six months, until I noticed in January 2006 that they were actually billing me for two set-top boxes. A minor expense, but still an additional $5 per month for the phantom box. This is the second time I've had this kind of trouble with Cablevision. Last time they tried to upsell me something, the sales person offered me free bundled HBO permanently. Turns out it was only free for one month. I should record every conversation I have with them.