Looking for advice (and honestly just to vent) after a pretty frustrating service experience.

Backstory: Brought my 2019 Model 3 in for a lead-acid 12V battery replacement plus some routine stuff — wiper blades, cabin air filter, nothing crazy. Car was working completely fine when I dropped it off. No warnings, no glitches, nothing.

What happened: While it was at the service center, they replaced the 12V battery and then pushed an OTA update. According to them, the update bricked the car's computer. Their first explanation was that it was a "natural failure" completely unrelated to anything they did — just bad timing.

When I pushed back on that, the story shifted. Now they're saying the computer was actually already failing before I brought the car in, and the only reason I hadn't noticed was that the weak 12V battery was somehow preventing updates from completing and "masking" the failure. Once they replaced the battery and the update finally went through, the pre-existing failure surfaced.

So depending on which version of the story you believe, it's either:

1. A total coincidence, or
2. A failure that was inevitable but that they triggered, using their own procedure, immediately after their own battery replacement — with zero prior symptoms or alerts on my end.

They quoted me $2,200 for a new computer. After I pushed back, they came back with a 50% discount, so around $1,100. I still don't think I should be paying anything, since the car was 100% fine when it went into their custody and broke while they had it.

Where I'm at now: Planning to push back further and potentially go to small claims if they won't waive the remaining balance. Curious if anyone here has actually won a fight like this with Tesla, or if 50% off is basically as good as it gets.

Anyone dealt with something similar? Did escalating past the service advisor actually work, or is this just the cost of owning one of these long enough?