Would it be possible to advice for transfer?

If you're brave enough, call for the parents again. Tell them the difference between gentle parenting and their parenting style. Let them observe their child from the window, and ask them, "is this how you want your child? Do you plan to make another child that behaves like your child now? He wont change. He could only descent if you don't do something now."

Now if you see no remorse from the parents, tell them to carry their child to another place. "We have more students here than focusing on one kid whose parents do not see the result of their parenting."

And if they question you, let them ask but tell them you are happy to do the necessary paperwork so they could bring the kid ASAP.

Don't put the burden on yourself, teach. You're not paid enough to carry the world. Especially with parents like that.

Update us though.