Bad service from Hyundai Boksburg

I brought my car for 45000km service on Tue 2 Feb 21.I was then advised upon assessment the clutch needed to be replaced and it will be ready in 3days I gave a go ahead calculatng to Friday for the car to be ready. I was advised the maintenance plan was lapsing after this service so it's good to replace it whilst still active. On Thursday it was confirmed that by Friday it will be ready they have an authorizationfrom the plan. Today its Friday I receive and sms that parts will only be available on Monday. What an inconvenience caused by this dealership I use this car for business the entire week till weekend I have lost an income. I was told there is nothing they can do as every process is electronic what a stupid excuse of me not getting my car at the time stipulated by them. I am extremely inconvenienced. Please help out