“ Yet you have forsaken me, and served other gods, and for this reason I will save you no more. Go and cry to the gods whom you have chosen, let them save you in the time of your distress. ”
As they have, once they were delivered, continually turned their back on Yahweh to serve other gods, let them now go to those gods to deliver them. Yahweh was finished with them. Let them look to the other gods to save them, and see what the result would be.