A Gloucester County man was sentenced to four years in prison Tuesday after previously pleading guilty to filing tax returns for a phony company for three years, according to authorities. Christian L. Whittaker, 43, of Williamstown, was sentenced to four years in prison and three years of supervised release Tuesday in an indictment charging him with making false claims against the Internal Revenue Service, the U.S. Attorney’s Office said in a statement. His attorney took issue with the sentence. “The guideline range applied over represents the severity of Mr. Whittaker’s prior record,” Whittak…