The app won't let me schedule an appointment for service. Back in February Safelite was going to order a new rain sensor for the windshield they installed and Tesla made an appointment that I didn't see until after it was scheduled. I never approved the estimate because the rain sensor started working again. There's no option to disapprove the estimate or cancel the appointment. Now it won't let me schedule an appointment. I have a leaking 4-way valve that needs to be replaced. Any ideas short of driving to the SC?