I don't blame you for switching to Optimum Online. Cablevision is infamous for "bait and switch" pricing for their cable prices, and raising prices on whim.
Hell, OOL started out at $29.95 (with a premium cable subscription) less than two years ago, and now it's $44.95 after the 3 month trial is over. At this rate, OOL will cost $70 a month within a few years, just like their obscene digital cable prices.
Meanwhile, my Earthlink DSL has been $49.95 for years. It also comes with nationwide dialup access and 10 MB of web hosting space, something that OOL doesn't offer.