I take my car to an…
I take my car to an independent shop after warranty ends. And when I have problems I make sure to be as detailed as possible, including taking a video if I can document it on my phone.
My last VW, the hatch held water, so that when the next time it rained, I had my camera handy and recorded the water dripping out and showed it to the dealership as proof. And when the wipers didn’t work, except after I shut off the car and restarted, I drove to the dealership in the rain, and let the car idle in the parking lot so that the technician can immediately experience the issue for diagnosis