How can we reconcile Judges 10:13 with Numbers 23:19?

Numbers 23:19 is very clear that God cannot change his mind and when He says He will do something He will do it. And yet in Judges 10:13 we see God saying : > But you have forsaken me and served other gods, so I will no longer save you. and then He saves them. I do not want answers from a Open Theist perspective.