This is most unfortunate, and the handling described is awful. That said, the hotel has not been too great in terms of service, and that it was Accor's best option in Milan speaks volumes of the overall quality of hotels in Italy....
By the way, LaGare Venice also left Accor at the same time, leaving the uber-expensive and revoltingly overdecorated Papadopoli as the only Accor option in Venice proper.