This happened to my son (in a 6 month period he was bit by the same child 15 times) at the same center but different city. Also, after the first bite they told us "we thought he was done with the bitting, he hasn't bit in a few weeks now". I ended up sitting in the director's office and talking to her about it many times. They kept telling us that they were going to change things but nothing ever changed. I eventually ended up making about 5 calls to the corporate offices and getting transfered and put on hold more times than I could keep track of. Nothing ever happened until I told them that if they didn't start taking care of the situation that I would be talking to the county, state, and the BBB.
Well things happened really quickly after that, they finally separated the child and my son, and for the past 2 months my son hasn't been bitten and the other child has not bitten anyone.
From experience they will not kick the children out they'll just tell you what they think you want to hear to make you think they are doing something about it.
This is now the 5th center with that name that I have either had problems with or heard of problems with, also my sister works for one and tells me all the time how they do a great job of covering things up.
My advice is when you start to have meetings and talks make sure that you are letting them know that you are going to check in with them every 2-3 days or something like that and that you want to see something done to prevent the bitting. If you do call the corporate offices don't let up keep pushing until you feel that you have been heard, understood, and taken seriously, and then still don't let up.
I was afraid that they would treat my child differently after all of the phone calls and meetings but they haven't. However, they have treated me differently everyone is on their toes when I walk in because they know that if I see something I don't like that I will do everything I can to make sure things are done right for the safety of my child.
Good Luck!