If you did the original work at another shop do you think they would investigate the source of the original uneven wear or just slap on new pads and rotors as well?
I honestly think most shops would go through the exact same repair process, but they wouldn't give you a caliper or change the rotor a second time.
Most places slap on new parts. If the problem is still there they will start diagnosing.
One of my family members had a problem with a brake job. When they took the car back, the mechanic said he doesn't know what happened, and asked for the full price to redo the brake job.