Why do Jehovah's Witnesses continue using a bad translation of God's name? (YHWH, Tetragrammaton)?

God's name, the Tetragrammaton which is 4 letters, YHWH and does not included vowels (because the original writings don't include vowels.) Most Scholars agree that the most accurate guess of God's name is in fact, YAHWEH. Jehovah's Witness's however, choose to ignore this completely yet they themselves implore that God's name is one of the most important parts of they're religion.... yet they continue to use a complete guess which is most likely an incorrect translation. WHY? WHY? WHY?