Unprofessional & Inconvenient Service Joburg City Ford

I have a complaint for Joburg City Ford, 93 Carr St, Johannesburg, 2000. We confirmed a booking for my vehicle service (Ford Eco Sport) 80 000km - on Monday 23 September - and got a booking for Saturday 28 September at 08h00. On Friday we received an SMS confirmation at 10h00 reminding us of the booking. On Friday at 16h40 my husband receives a call from the dealership informing us that they do not have filters hence we won't be able to take our vehicle for service on Friday. My husband tried to contact the dealer service manager but could not get him. He lodged a complaint and a gentleman called him (unfortunately he is unable to remember the name) he apologized for the inconvience and was going to get the manager to call, to date we are waiting the manager of the service department to call. This is rather inconvenient and unacceptable - how can the dealership only realise at 16h40 that they don't have parts to service my vehicle? Why then did we receive a message confirmation at 10h00? The reason my vehicle was booked on a weekend, as I use my vehicle to travel to work, and am not very close to the dealership. This was dealt very unprofessionally with not regard to the inconvenience Ford would cause with to the customer. And to add to this, the manager who should take responsibility for this has not had the decency to call us? Is this the level of service we get from Ford?