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I'm not sure why they would sand the pads and rotors for the chirping problem. A chirping sound usually comes from the brake pad vibrating against the caliper mounting plate. If the guide clips (metal clips that hold the pads inside the calipers) are loose, the pad will move around inside the caliper creating the telltale highpitched sound.
If it's just the one wheel, then examine the caliper and pads. Either adjust the guide clips to fit tighter against the pad or get new ones if necessary. Maybe the dealer accidentally reused the old clips from old pads on that particular wheel when they did the brakes. If that fails to silence the noise, then try some of that brake pad adhesive they sell in small packs at the local autoparts store.
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