Please take your little one out of that centre!!!! If the provider can not even be bothered to tell you what her concerns are she certainly can not be bothered making any effort to work through them. You don't owe a new provider a reason for looking for new care. It would probably be helpful to both your family and a new provider to be aware that there are some behaviour issues so you can all work together!!!! Maybe try looking for someone with a Montessori background so that his independence is encouraged within a structured setting.