We arrived Saturday afternoon on a family 3 night ...

We arrived Saturday afternoon on a family 3 night break and have not been able to get a swimming slot, we had booked one slot available(the only one available for a 4 day break) for Monday night at 9pm with children aged between 1 to 11 to be told Monday afternoon it is cancelled. People have been able to ring weeks before arrival making it an unfair playing field.