Hello,
1) The society providing water supply and billing the pre- school in itself can not be taken as a permission from the society.
2) Society is at liberty to revoke the permission as Managing Committee resolution backed by an AGM meeting can take a decision to revoke the permission , especially in the absence of any written permission.
3) You can certainly seek a stay on the ground that you mentioned and besides that cite reasons that you will need time to find alternate arrangements or accommodation to house the pre school and that such a move with no notice will render a number of people unemployed.