The correct spelling of "gat due" is actually "got to". The reason for this misspelling may be due to the way the phrase sounds when spoken quickly, with the "t" in "got" and the "d" in "to" blending together into a single sound. In IPA phonetic transcription, the correct pronunciation of "got to" is /ɡɒt tuː/, with the two separate sounds clearly distinguished. It's important to use correct spelling to avoid confusion in written communication.