That has got to be so frustrating. This is why I cannot rely on our Tesla (car) because the Tesla (corporate) processes are not streamlined for good customer service. My contingency if our Tesla is out of commission is to fall back on our other 3 cars. 2 months ago I brought our Model S to have the inactive rear defroster looked at. It took a month to schedule an appointment at our local but overwhelmed SC. The drop-off line at 2PM was 9 cars deep and backed up on the street well beyond the driveway. Thinking it was just a fuse, I thought I might get my car back that same day (how naive was I?). The car sat in the back of the service center for 3 days, then moved to an off-site auxiliary lot for another 5 days. They finally got to work on the car and took about 3 hours of service bay time. I declined a loaner car because I have extra cars around but it would have been easier and potentially cheaper for Tesla to just service the car when they were ready for it.
The car is great when you don't need any service, but when it does need service I start thinking about other car brands. How awesome would it be to have Tesla design and technology, with Honda/Toyota reliability, MB luxury, with a service center as efficient as Costco or Ikea? A guy can only dream...