I heard Waterbury yeshiva is equipped to deal with boys whom other yeshivas fail.
As R Kestenbaum of that yeshiva writes “we are losing our resh lakishes”. We don’t know the circumstances, but you also need to consider whether it is the best for your child to be in this place where they do not want him. He might be better at a place like Waterbury or learning with his parents and private tutors. See if a change improves his situation. Deal with the child first, do not get distracted to deal with the yeshiva.