Front camber adjustment

First post so be gentle, warning story time.

So I have a 2019 nissan sentra S 1.8L (69k miles giggity, with all OM or OEM parts) that a few months ago I took to mavis for a tire balancing and an alignment check. Told the Gary Bussey looking service manager to only preform the alignment if it was necessary. When I come back he said he preformed the alignment as my camber was -.40⁰ ish (I don't remember exactly it was 6 months ago and he only showed me for a few seconds as a picture on his phone)

Few months go by I'm enjoying working on my car so I start studying for my ASE G1 to get out of delivery work. As I study the suspension section I learn most modern cars have preset negative camber to compensate for load.

So I open my Nissan service manual and look for my camber specs and find out it comes with -.42⁰ and that there's no way to adjust it with stock components.

So I call mavis and ask for a refund, they ofcoarse give me the run around "my machine doesn't need to be calibrated for your vehicle it's got a database, I've been doing this 10 years you don't know what you're talking about, etc"

So I came into the store with my printed out section of my service manual. Now the story is "oh well we have ways of doing it even when they can't be, you don't have stock parts, I can't give you a refund until you take it some where else or I get it on the rack"

So now I have to come in on Monday @ 8am to put my baby on their machine just to prove they either A pulled it out of spec or B didn't do anything and made me pay anyways.

Is this worth my time? I feel like I've done plenty of research unless you guys know anything I don't everything I can see via the service info and other forums suggest I'm being played with.