New York Attorney General Eric Schneiderman is accusing Charter Communications Inc. in a lawsuit of deliberately misleading its internet subscribers and failing to deliver the speeds it promised.

The lawsuit, filed in New York Supreme Court on Wednesday, alleges that Time Warner Cable, which Charter purchased last year, knowingly promised speeds in advertisements that it knew it could not deliver, leaving New York consumers with buffering delays for services like Netflix and popular online games like “League of Legends.”

The business practices cited in the suit date back to at least January 2012. Charter now offers Time Warner Cable services under the brand Spectrum.

The alleged business practices cited in the suit date back to at least January 2012. Charter, now the second-largest U.S. cable operator, acquired Time Warner Cable last year.

The attorney general’s office, helped by Columbia professor and cable critic Tim Wu, had been investigating New York operators over their internet speeds for 16 months. They initially looked at Cablevision Systems Corp., now owned by Altice USA, as well as Verizon Communications Inc.’s Fios, neither of which have been sued.