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FWIW back when I did this for a living the usual treatment was to lightly sand the glaze off the pads. Then you can treat the pads with a BG product called "brake quiet"(I'm sure there are other brands as well). it soaks into the pads and makes them less noisy for a bit. Also clean and relube all the contact points to make sure those aren't causing the issue. Then we'd bed the pads ourselves. generally with this treatment on a non-terrible pad would fix any squeaks/groans/rattles.
on a new car, you can try to bed the brakes again, see if that will fix the problem. It may/may not. Often times it's the driver that causes the squeals. (no, not you....just all the other people who have the issue).
my .02, It's worth what you paid for it.
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The best 2013 M sport is owned by me.
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