Eight years after Derek Gubala canceled his contract with Time Warner Cable, he found out the company still had the personal information he provided when he signed up as a customer — including his Social Security number, date of birth and credit card data.Alleging Time Warner violated Section 551(e) of the Cable Communications Policy Act — and that Section 551(f) authorized a lawsuit — Gubala filed a class-action complaint in federal court.Section 551(e) says a cable company “shall destroy …