Stand your ground for sure. You are in the right, and you have it in your contract that they must give you notice. Whether or not they continue to bring him back is up to them. I imagine they are only meeting to try to talk you out of requiring pay.

I might even go so far as to cut the meeting short if they don't pay you. Tell them that you can no longer meet or talk with them, as you will be taking them to claims court for breach of contract.

Good luck!