It is not contradictory for a devotee to call the Supreme Lord by any one of the various names of His plenary expansions because the original Personality of Godhead includes all such categories. Since the plenary expansions exist within the original person, one may call Him by any of these names. In Sri Caitanya-bhagavata (Madhya 6.95) Lord Caitanya says, "I was lying asleep in the ocean of milk, but I was awakened by the call of Nada, Sri Advaita Prabhu." Here the Lord refers to His form as Ksirodakasayi Visnu.