Cablevision Systems Corp. and Altice USA, the American unit of the Netherlands company that bought the Bethpage cable operator in June, are charged in a suit seeking class action status with underpaying an employee over a four-year period.

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Phyllis Carter, an hourly customer-service employee in Bethpage, contends in the suit filed in U.S. District Court in Central Islip that she was underpaid about a half-hour each week during the four-year period, including some overtime pay.

Lisa Anselmo, an Altice USA spokeswoman, said the company couldn’t comment on the lawsuit because it hasn’t been served a copy. But she said, “The company offers competitive compensation and operates with the highest workplace standards and practices.” Altice owns 25 percent of Newsday Media Group.