My advise is to send only a neutral written notice. If there is any verbal communication, keep it positive. This. The organization isn't going to care about y

My advise is to send only a neutral written notice. If there is any verbal communication, keep it positive. This. The organization isn't going to care about your feedback. They're not going to change things. Best thing to do is just save your breath and move forward. It's their problem now, not yours.