Never had to dispute it at a Marriott property, but did have to at the Delano in Vegas once. I was charged $15.00 for a cup of coffee (the room coffee machine not being free is absurd in the first place) because a housekeeper didn't restock the cups (plastic wrapped with a pod inside) before my arrival. When the housekeeper showed up the next day and added another one they marked that I had taken the first one. 5 min with the front desk and it was resolved.