Disgusting service from Ford Dealer

I am from a non profit organization that provide services to special needs school children and we own Ford Transit bus. It is very important that the bus be available every day as these children need special treatment and parents do not have the resources to transit children to special school. The vehicle needs to go in for a service and replacement of brakes. We arranged with the For Dealership on Monday10 February to order the necessary parts to make sure when the vehicle goes in for the service that all can be done in one day to ensure there is not too much of a disruption for the children. We agreed to allow sufficient time to order the parts and the vehicle went in on Thursday, 13 February very early. Thursday afternoon I got a call from teh dealership that they didi not order the parts yet and they need to order it the same day and hope to have the job done by the same afternoon. Late afternoon they call again to inform us the vehicle will jot be ready. We stress teh point that the children are dependent on the vehicle and asked for a replacement vehicle until they complete the service. They refuse to assist. On Friday afternoon i got a call again from Ford Port Shepstone to inform me the vehicle will not be ready as they still waiting for parts and it will only arrive on Monday. I was furious and request to speak with the Dealer Principle, Joe. I explain our situation and he indicated that he cannot assist us with a vehicle to transport the children and refuse to talk any further with me This kind of service is disgusting. We have the vehicle inspected before it went in for the service and allow sufficient time for parts to be ordered and on top of it they refuse to come up with a solution to address teh issue due to their negligence!!