If antifreeze actually got into the trans, it is all over. I'm very surprised that the dealer didn't inform you of this.
You will need to overhaul the transmission and replace all of the clutches and also anything that is made out of plastic in the trans- solenoids, plastic washers, etc.
Flushing it out doesn't help.
Antifreeze or water in the transmission immediately starts to dissolve the glue that holds the paper lining to the steel backing of the clutch plates- much like you can dissolve the glue on an envelope with steam or hot water.
-John
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