Brake Grinding Noise problems of the 2016 Mitsubishi Outlander

Recently replaced the rotors and pads on all four wheels of my Outlander. All but the rear passenger are working fine, while the rear passenger side is making a grinding noise. We've replaced the brake pads 3 times, replaced the rotor once, and even replaced the whole caliper; it's still making a grinding sound. There's a recall posted for some 2016 Outlanders for the parking brake not engaging/disengaging properly and we might think this is the problem; however, this recall is not applied to our 2016 Outlander. I think we are having the exact problem that is listed on this recall.