Dictate two times a long sentence of about 20 words. When you have finished, and only when you have finished, students write what they remember. Dictate a third and fourth time if needed.
To finish a student could come to the whiteboard and the rest of the class dictate back to them the sentence. This is good because there is bound to be some conflict in what is right.
When all have the final text written beautifully on the board and on paper, try some sentence games: shrink or expand the sentence or change the words in the sentence so that it is more related to them.
Instead of listening, present the text on the whiteboard for a minute before removing it and then students try to recreate it. (Flash Dictation)