2022 Nissan Pathfinder - Fast brake wear

But the 22 Pathfinder 3 years ago and we’re up to 18,000 mi on it and the rear brakes were squealing when you were going in reverse. Needless to say got him repaired $540 later New rotors new pads mechanic said he’s never seen brakes fail that fast especially the rare and the fronts were okay.

Mechanic said they wore out.
What are you expecting internet to add?
I think ur car was built with correct parts.

Are you saying the new rotors and pads have worn out?