My 2016 Silverado has been in service now for 4 DA...

My 2016 Silverado has been in service now for 4 DAYS! to repair the windshield washer. It is still not repaired. I made an appointment for Tuesday at 7:45 it is now Friday 2:50pm and they still can't give me an answer as to when it will be fixed! I'm going to pick it up .....unrepaired and take it to another dealership. This is a warranty repair. Worst customer service I have experience in my 43 years of new vehicle ownership.